[thirdparty/libarchive.git] / configure.ac

dnl Process this file with autoconf to produce a configure script.

dnl First, define all of the version numbers up front.
dnl In particular, this allows the version macro to be used in AC_INIT

dnl These first two version numbers are updated automatically on each release.
m4_define([LIBARCHIVE_VERSION_S],[3.6.3dev])
m4_define([LIBARCHIVE_VERSION_N],[3006003])

dnl bsdtar and bsdcpio versioning tracks libarchive
m4_define([BSDTAR_VERSION_S],LIBARCHIVE_VERSION_S())
m4_define([BSDCPIO_VERSION_S],LIBARCHIVE_VERSION_S())
m4_define([BSDCAT_VERSION_S],LIBARCHIVE_VERSION_S())

AC_PREREQ([2.71])

#
# Now starts the "real" configure script.
#

AC_INIT([libarchive],[LIBARCHIVE_VERSION_S()],[libarchive-discuss@googlegroups.com])
# Make sure the srcdir contains "libarchive" directory
AC_CONFIG_SRCDIR([libarchive])
# Use auxiliary subscripts from this subdirectory (cleans up root)
AC_CONFIG_AUX_DIR([build/autoconf])
# M4 scripts
AC_CONFIG_MACRO_DIR([build/autoconf])
# Must follow AC_CONFIG macros above...
AM_INIT_AUTOMAKE([1.11 dist-xz dist-zip])
AM_MAINTAINER_MODE([enable])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

# Libtool's "interface version" can be computed from the libarchive version.

# Libtool interface version bumps on any API change, so increments
# whenever libarchive minor version does.
ARCHIVE_MINOR=$(( (LIBARCHIVE_VERSION_N() / 1000) % 1000 ))
# Libarchive 2.7 == libtool interface 9 = 2 + 7
# Libarchive 2.8 == libtool interface 10 = 2 + 8
# Libarchive 2.9 == libtool interface 11 = 2 + 8
# Libarchive 3.0 == libtool interface 12
# Libarchive 3.1 == libtool interface 13
ARCHIVE_INTERFACE=`echo $((13 + ${ARCHIVE_MINOR}))`
# Libarchive revision is bumped on any source change === libtool revision
ARCHIVE_REVISION=$(( LIBARCHIVE_VERSION_N() % 1000 ))
# Libarchive minor is bumped on any interface addition === libtool age
ARCHIVE_LIBTOOL_VERSION=$ARCHIVE_INTERFACE:$ARCHIVE_REVISION:$ARCHIVE_MINOR

# Stick the version numbers into config.h
AC_DEFINE([__LIBARCHIVE_CONFIG_H_INCLUDED], [1],
	[Internal macro for sanity checks])
AC_DEFINE([LIBARCHIVE_VERSION_STRING],"LIBARCHIVE_VERSION_S()",
	[Version number of libarchive])
AC_DEFINE_UNQUOTED([LIBARCHIVE_VERSION_NUMBER],"LIBARCHIVE_VERSION_N()",
	[Version number of libarchive as a single integer])
AC_DEFINE([BSDCPIO_VERSION_STRING],"BSDCPIO_VERSION_S()",
	[Version number of bsdcpio])
AC_DEFINE([BSDTAR_VERSION_STRING],"BSDTAR_VERSION_S()",
	[Version number of bsdtar])
AC_DEFINE([BSDCAT_VERSION_STRING],"BSDTAR_VERSION_S()",
	[Version number of bsdcat])

# The shell variables here must be the same as the AC_SUBST() variables
# below, but the shell variable names apparently cannot be the same as
# the m4 macro names above.  Why?  Ask autoconf.
BSDCPIO_VERSION_STRING=BSDCPIO_VERSION_S()
BSDTAR_VERSION_STRING=BSDTAR_VERSION_S()
BSDCAT_VERSION_STRING=BSDCAT_VERSION_S()
LIBARCHIVE_VERSION_STRING=LIBARCHIVE_VERSION_S()
LIBARCHIVE_VERSION_NUMBER=LIBARCHIVE_VERSION_N()

# Substitute the above version numbers into the various files below.
# Yes, I believe this is the fourth time we define what are essentially
# the same symbols.  Why? Ask autoconf.
AC_SUBST(ARCHIVE_LIBTOOL_VERSION)
AC_SUBST(BSDCPIO_VERSION_STRING)
AC_SUBST(BSDTAR_VERSION_STRING)
AC_SUBST(BSDCAT_VERSION_STRING)
AC_SUBST(LIBARCHIVE_VERSION_STRING)
AC_SUBST(LIBARCHIVE_VERSION_NUMBER)

AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile])
AC_CONFIG_FILES([build/pkgconfig/libarchive.pc])

# Check for host type
AC_CANONICAL_HOST

dnl Compilation on mingw and Cygwin needs special Makefile rules
inc_windows_files=no
inc_cygwin_files=no
case "$host_os" in
  *mingw* ) inc_windows_files=yes ;;
  *cygwin* | *msys*) inc_cygwin_files=yes ;;
esac
AM_CONDITIONAL([INC_WINDOWS_FILES], [test $inc_windows_files = yes])
AM_CONDITIONAL([INC_CYGWIN_FILES], [test $inc_cygwin_files = yes])

dnl Defines that are required for specific platforms (e.g. -D_POSIX_SOURCE, etc)
PLATFORMCPPFLAGS=
case "$host_os" in
  *mingw* ) PLATFORMCPPFLAGS=-D__USE_MINGW_ANSI_STDIO -D__MINGW_USE_VC2005_COMPAT ;;
esac
AC_SUBST(PLATFORMCPPFLAGS)

# Checks for programs.
AC_PROG_CC
AM_PROG_CC_C_O
AC_PROG_CPP
AC_USE_SYSTEM_EXTENSIONS
AC_LIBTOOL_WIN32_DLL
AC_PROG_LIBTOOL
AC_CHECK_TOOL([STRIP],[strip])
AC_PROG_MKDIR_P

#
# Options for building bsdtar.
#
# Default is to build bsdtar, but allow people to override that.
#
AC_ARG_ENABLE([bsdtar],
	[AS_HELP_STRING([--enable-bsdtar], [enable build of bsdtar (default)])
	AS_HELP_STRING([--enable-bsdtar=static], [force static build of bsdtar])
	AS_HELP_STRING([--enable-bsdtar=shared], [force dynamic build of bsdtar])
AS_HELP_STRING([--disable-bsdtar], [disable build of bsdtar])],
	[], [enable_bsdtar=yes])

case "$enable_bsdtar" in
yes)
	if test "$enable_static" = "no"; then
		static_bsdtar=no
	else
		static_bsdtar=yes
	fi
	build_bsdtar=yes
	;;
dynamic|shared)
	if test "$enable_shared" = "no"; then
		AC_MSG_FAILURE([Shared linking of bsdtar requires shared libarchive])
	fi
	build_bsdtar=yes
	static_bsdtar=no
	;;
static)
	build_bsdtar=yes
	static_bsdtar=yes
	;;
no)
	build_bsdtar=no
	static_bsdtar=no
	;;
*)
	AC_MSG_FAILURE([Unsupported value for --enable-bsdtar])
	;;
esac

AM_CONDITIONAL([BUILD_BSDTAR], [ test "$build_bsdtar" = yes ])
AM_CONDITIONAL([STATIC_BSDTAR], [ test "$static_bsdtar" = yes ])

#
# Options for building bsdcat.
#
# Default is to build bsdcat, but allow people to override that.
#
AC_ARG_ENABLE([bsdcat],
	[AS_HELP_STRING([--enable-bsdcat], [enable build of bsdcat (default)])
	AS_HELP_STRING([--enable-bsdcat=static], [force static build of bsdcat])
	AS_HELP_STRING([--enable-bsdcat=shared], [force dynamic build of bsdcat])
AS_HELP_STRING([--disable-bsdcat], [disable build of bsdcat])],
	[], [enable_bsdcat=yes])

case "$enable_bsdcat" in
yes)
	if test "$enable_static" = "no"; then
		static_bsdcat=no
	else
		static_bsdcat=yes
	fi
	build_bsdcat=yes
	;;
dynamic|shared)
	if test "$enable_shared" = "no"; then
		AC_MSG_FAILURE([Shared linking of bsdcat requires shared libarchive])
	fi
	build_bsdcat=yes
	static_bsdcat=no
	;;
static)
	build_bsdcat=yes
	static_bsdcat=yes
	;;
no)
	build_bsdcat=no
	static_bsdcat=no
	;;
*)
	AC_MSG_FAILURE([Unsupported value for --enable-bsdcat])
	;;
esac

AM_CONDITIONAL([BUILD_BSDCAT], [ test "$build_bsdcat" = yes ])
AM_CONDITIONAL([STATIC_BSDCAT], [ test "$static_bsdcat" = yes ])

#
# Options for building bsdcpio.
#
# Default is not to build bsdcpio, but that can be overridden.
#
AC_ARG_ENABLE([bsdcpio],
	[AS_HELP_STRING([--enable-bsdcpio], [enable build of bsdcpio (default)])
	AS_HELP_STRING([--enable-bsdcpio=static], [static build of bsdcpio])
	AS_HELP_STRING([--enable-bsdcpio=shared], [dynamic build of bsdcpio])
AS_HELP_STRING([--disable-bsdcpio], [disable build of bsdcpio])],
	[], [enable_bsdcpio=yes])

case "$enable_bsdcpio" in
yes)
	if test "$enable_static" = "no"; then
	   static_bsdcpio=no
	else
	   static_bsdcpio=yes
        fi
	build_bsdcpio=yes
	;;
dynamic|shared)
	if test "$enabled_shared" = "no"; then
	   AC_MSG_FAILURE([Shared linking of bsdcpio requires shared libarchive])
	fi
	build_bsdcpio=yes
	;;
static)
	build_bsdcpio=yes
	static_bsdcpio=yes
	;;
no)
	build_bsdcpio=no
	static_bsdcpio=no
	;;
*)
	AC_MSG_FAILURE([Unsupported value for --enable-bsdcpio])
	;;
esac

AM_CONDITIONAL([BUILD_BSDCPIO], [ test "$build_bsdcpio" = yes ])
AM_CONDITIONAL([STATIC_BSDCPIO], [ test "$static_bsdcpio" = yes ])

# Set up defines needed before including any headers
case $host in
  *mingw* | *cygwin* | *msys*  )
  AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
    [[#ifdef _WIN32_WINNT
     # error _WIN32_WINNT already defined
     #endif
    ]],[[;]])
  ],[
    AC_DEFINE([_WIN32_WINNT], 0x0502, [Define to '0x0502' for Windows Server 2003 APIs.])
    AC_DEFINE([NTDDI_VERSION], 0x05020000, [Define to '0x05020000' for Windows Server 2003 APIs.])
  ])
  AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
    [[#ifdef WINVER
     # error WINVER already defined
     #endif
    ]],[[;]])
  ],[
    AC_DEFINE([WINVER], 0x0502, [Define to '0x0502' for Windows Server 2003 APIs.])
  ])
  ;;
esac

#
# Options for building bsdunzip.
#
# Default is to build bsdunzip, but allow people to override that.
# Bsdunzip has not yet been ported for Windows
#
case "$host_os" in
  *mingw* | *msys*)
	enable_bsdunzip=no
	;;
  *)
	AC_ARG_ENABLE([bsdunzip],
	  [AS_HELP_STRING([--enable-bsdunzip], [enable build of bsdunzip (default)])
	  AS_HELP_STRING([--enable-bsdunzip=static], [force static build of bsdunzip])
	  AS_HELP_STRING([--enable-bsdunzip=shared], [force dynamic build of bsdunzip])
	  AS_HELP_STRING([--disable-bsdunzip], [disable build of bsdunzip])],
	  [], [enable_bsdunzip=yes])
	;;
esac

case "$enable_bsdunzip" in
yes)
	if test "$enable_static" = "no"; then
		static_bsdunzip=no
	else
		static_bsdunzip=yes
	fi
	build_bsdunzip=yes
	;;
dynamic|shared)
	if test "$enable_shared" = "no"; then
		AC_MSG_FAILURE([Shared linking of bsdunzip requires shared libarchive])
	fi
	build_bsdunzip=yes
	static_bsdunzip=no
	;;
static)
	build_bsdunzip=yes
	static_bsdunzip=yes
	;;
no)
	build_bsdunzip=no
	static_bsdunzip=no
	;;
*)
	AC_MSG_FAILURE([Unsupported value for --enable-bsdunzip])
	;;
esac

AM_CONDITIONAL([BUILD_BSDUNZIP], [ test "$build_bsdunzip" = yes ])
AM_CONDITIONAL([STATIC_BSDUNZIP], [ test "$static_bsdunzip" = yes ])

# Checks for header files.
AC_HEADER_DIRENT
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS([acl/libacl.h attr/xattr.h])
AC_CHECK_HEADERS([copyfile.h ctype.h])
AC_CHECK_HEADERS([errno.h ext2fs/ext2_fs.h fcntl.h fnmatch.h grp.h])

AC_CACHE_CHECK([whether EXT2_IOC_GETFLAGS is usable],
    [ac_cv_have_decl_EXT2_IOC_GETFLAGS],
    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@include <sys/ioctl.h>
@%:@include <ext2fs/ext2_fs.h>],
                                   [int x = EXT2_IOC_GETFLAGS])],
                  [AS_VAR_SET([ac_cv_have_decl_EXT2_IOC_GETFLAGS], [yes])],
                  [AS_VAR_SET([ac_cv_have_decl_EXT2_IOC_GETFLAGS], [no])])])

AS_VAR_IF([ac_cv_have_decl_EXT2_IOC_GETFLAGS], [yes],
    [AC_DEFINE_UNQUOTED([HAVE_WORKING_EXT2_IOC_GETFLAGS], [1],
                    [Define to 1 if you have a working EXT2_IOC_GETFLAGS])])

AC_CHECK_HEADERS([inttypes.h io.h langinfo.h limits.h])
AC_CHECK_HEADERS([linux/fiemap.h linux/fs.h linux/magic.h linux/types.h])

AC_CACHE_CHECK([whether FS_IOC_GETFLAGS is usable],
    [ac_cv_have_decl_FS_IOC_GETFLAGS],
    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@include <sys/ioctl.h>
@%:@include <linux/fs.h>],
                                   [int x = FS_IOC_GETFLAGS])],
                  [AS_VAR_SET([ac_cv_have_decl_FS_IOC_GETFLAGS], [yes])],
                  [AS_VAR_SET([ac_cv_have_decl_FS_IOC_GETFLAGS], [no])])])

AS_VAR_IF([ac_cv_have_decl_FS_IOC_GETFLAGS], [yes],
    [AC_DEFINE_UNQUOTED([HAVE_WORKING_FS_IOC_GETFLAGS], [1],
                    [Define to 1 if you have a working FS_IOC_GETFLAGS])])

AC_CHECK_HEADERS([locale.h membership.h paths.h poll.h pthread.h pwd.h])
AC_CHECK_HEADERS([readpassphrase.h signal.h spawn.h])
AC_CHECK_HEADERS([stdarg.h stdint.h stdlib.h string.h])
AC_CHECK_HEADERS([sys/acl.h sys/cdefs.h sys/ea.h sys/extattr.h])
AC_CHECK_HEADERS([sys/ioctl.h sys/mkdev.h sys/mount.h sys/queue.h])
AC_CHECK_HEADERS([sys/param.h sys/poll.h sys/richacl.h])
AC_CHECK_HEADERS([sys/select.h sys/statfs.h sys/statvfs.h sys/sysmacros.h])
AC_CHECK_HEADERS([sys/time.h sys/utime.h sys/utsname.h sys/vfs.h sys/xattr.h])
AC_CHECK_HEADERS([time.h unistd.h utime.h wchar.h wctype.h])
AC_CHECK_HEADERS([windows.h])
# check windows.h first; the other headers require it.
AC_CHECK_HEADERS([wincrypt.h winioctl.h],[],[],
[[#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
]])

# Checks for libraries.
AC_ARG_WITH([zlib],
  AS_HELP_STRING([--without-zlib], [Don't build support for gzip through zlib]))

if test "x$with_zlib" != "xno"; then
  AC_CHECK_HEADERS([zlib.h])
  AC_CHECK_LIB(z,inflate)
fi

AC_ARG_WITH([bz2lib],
  AS_HELP_STRING([--without-bz2lib], [Don't build support for bzip2 through bz2lib]))

if test "x$with_bz2lib" != "xno"; then
  AC_CHECK_HEADERS([bzlib.h])
  case "$host_os" in
    *mingw* | *cygwin* | *msys*)
      dnl AC_CHECK_LIB cannot be used on the Windows port of libbz2, therefore
	  dnl use AC_LINK_IFELSE.
	  AC_MSG_CHECKING([for BZ2_bzDecompressInit in -lbz2])
      old_LIBS="$LIBS"
      LIBS="-lbz2 $LIBS"
      AC_LINK_IFELSE(
        [AC_LANG_SOURCE(#include <bzlib.h>
          int main() { return BZ2_bzDecompressInit(NULL, 0, 0); })],
        [ac_cv_lib_bz2_BZ2_bzDecompressInit=yes],
        [ac_cv_lib_bz2_BZ2_bzDecompressInit=no])
      LIBS="$old_LIBS"
	  AC_MSG_RESULT($ac_cv_lib_bz2_BZ2_bzDecompressInit)
      if test "x$ac_cv_lib_bz2_BZ2_bzDecompressInit" = xyes; then
        AC_DEFINE([HAVE_LIBBZ2], [1], [Define to 1 if you have the `bz2' library (-lbz2).])
        LIBS="-lbz2 $LIBS"
      fi
    ;;
    *)
      AC_CHECK_LIB(bz2,BZ2_bzDecompressInit)
    ;;
  esac
fi

AC_ARG_WITH([libb2],
  AS_HELP_STRING([--without-libb2], [Don't build support for BLAKE2 through libb2]))

if test "x$with_libb2" != "xno"; then
  AC_CHECK_HEADERS([blake2.h])
  AC_CHECK_LIB(b2,blake2sp_init)
fi

AM_CONDITIONAL([INC_BLAKE2], [test "x$ac_cv_lib_b2_blake2sp_init" != "xyes"])

AC_ARG_WITH([iconv],
  AS_HELP_STRING([--without-iconv], [Don't try to link against iconv]))

if test "x$with_iconv" != "xno"; then
  AM_ICONV
  AC_CHECK_HEADERS([iconv.h],[],[],[#include <stdlib.h>])
  if test "x$am_cv_func_iconv" = "xyes"; then
    AC_CHECK_HEADERS([localcharset.h])
    am_save_LIBS="$LIBS"
    LIBS="${LIBS} ${LIBICONV}"
    if test -n "$LIBICONV"; then
      LIBSREQUIRED="$LIBSREQUIRED${LIBSREQUIRED:+ }iconv"
    fi
    AC_CHECK_FUNCS([locale_charset])
    LIBS="${am_save_LIBS}"
    if test "x$ac_cv_func_locale_charset" != "xyes"; then
      # If locale_charset() is not in libiconv, we have to find libcharset.
      AC_CHECK_LIB(charset,locale_charset)
    fi
  fi
fi

AC_ARG_WITH([lz4],
  AS_HELP_STRING([--without-lz4], [Don't build support for lz4 through liblz4]))

if test "x$with_lz4" != "xno"; then
  AC_CHECK_HEADERS([lz4.h lz4hc.h])
  AC_CHECK_LIB(lz4,LZ4_decompress_safe)
fi

AC_ARG_WITH([zstd],
  AS_HELP_STRING([--without-zstd], [Don't build support for zstd through libzstd]))

if test "x$with_zstd" != "xno"; then
  AC_CHECK_HEADERS([zstd.h])
  AC_CHECK_LIB(zstd,ZSTD_decompressStream)
  AC_CHECK_LIB(zstd,ZSTD_compressStream,
    AC_DEFINE([HAVE_LIBZSTD_COMPRESSOR], [1], [Define to 1 if you have the `zstd' library (-lzstd) with compression support.]))
fi

AC_ARG_WITH([lzma],
  AS_HELP_STRING([--without-lzma], [Don't build support for xz through lzma]))

if test "x$with_lzma" != "xno"; then
  AC_CHECK_HEADERS([lzma.h])
  AC_CHECK_LIB(lzma,lzma_stream_decoder)
  # Some pre-release (but widely distributed) versions of liblzma
  # included a disabled version of lzma_stream_encoder_mt that
  # fools a naive AC_CHECK_LIB or AC_CHECK_FUNC, so we need
  # to do something more complex here:
  AC_CACHE_CHECK(
    [whether we have multithread support in lzma],
    ac_cv_lzma_has_mt,
    [AC_LINK_IFELSE([
      AC_LANG_PROGRAM([[#include <lzma.h>]
                       [#if LZMA_VERSION < 50020000]
                       [#error unsupported]
                       [#endif]],
                      [[lzma_stream_encoder_mt(0, 0);]])],
      [ac_cv_lzma_has_mt=yes], [ac_cv_lzma_has_mt=no])])
  if test "x$ac_cv_lzma_has_mt" != xno; then
	  AC_DEFINE([HAVE_LZMA_STREAM_ENCODER_MT], [1], [Define to 1 if you have the `lzma_stream_encoder_mt' function.])
  fi
fi

AC_ARG_WITH([lzo2],
  AS_HELP_STRING([--with-lzo2], [Build with LZO support from liblzo2]))

if test "x$with_lzo2" = "xyes"; then
  AC_CHECK_HEADERS([lzo/lzoconf.h lzo/lzo1x.h])
  AC_CHECK_LIB(lzo2,lzo1x_decompress_safe)
fi

AC_ARG_WITH([cng],
  AS_HELP_STRING([--without-cng], [Don't build support of CNG(Crypto Next Generation)]))

AC_ARG_WITH([mbedtls],
  AS_HELP_STRING([--with-mbedtls], [Build with crypto support from mbed TLS]))
AC_ARG_WITH([nettle],
  AS_HELP_STRING([--with-nettle], [Build with crypto support from Nettle]))
AC_ARG_WITH([openssl],
  AS_HELP_STRING([--without-openssl], [Don't build support for mtree and xar hashes through openssl]))
case "$host_os" in
  *darwin* ) with_openssl=no ;;
esac

AC_ARG_WITH([xml2],
  AS_HELP_STRING([--without-xml2], [Don't build support for xar through libxml2]))
AC_ARG_WITH([expat],
  AS_HELP_STRING([--without-expat], [Don't build support for xar through expat]))

if test "x$with_xml2" != "xno"; then
  PKG_PROG_PKG_CONFIG
  PKG_CHECK_MODULES(LIBXML2_PC, [libxml-2.0], [
    CPPFLAGS="${CPPFLAGS} ${LIBXML2_PC_CFLAGS}"
    LIBS="${LIBS} ${LIBXML2_PC_LIBS}"
    AC_CHECK_LIB(xml2,xmlInitParser,[true],AC_MSG_FAILURE(Missing xml2 library))
  ], [
    AC_CHECK_LIB(xml2,xmlInitParser)
  ])
  AC_CHECK_HEADERS([libxml/xmlreader.h libxml/xmlwriter.h])
fi
if test "x$ac_cv_header_libxml_xmlreader_h" != "xyes"; then
  if test "x$with_expat" != "xno"; then
    AC_CHECK_HEADERS([expat.h])
    AC_CHECK_LIB(expat,XML_ParserCreate)
  fi
fi

AC_ARG_ENABLE([posix-regex-lib],
  [AS_HELP_STRING([--enable-posix-regex-lib],
    [choose what library to use for POSIX regular expression support (default: auto)])
  AS_HELP_STRING([--enable-posix-regex-lib=libc], [use libc POSIX regular expression support])
  AS_HELP_STRING([--enable-posix-regex-lib=libregex], [use libregex POSIX regular expression support])
  AS_HELP_STRING([--enable-posix-regex-lib=libpcreposix], [use libpcreposix POSIX regular expression support])
  AS_HELP_STRING([--disable-posix-regex-lib], [don't enable POSIX regular expression support])],
  [], [enable_posix_regex_lib=auto])

posix_regex_lib_found=
if test "$enable_posix_regex_lib" = "auto" || test "$enable_posix_regex_lib" = "libc" || test "$enable_posix_regex_lib" = "libregex"; then
  AC_CHECK_HEADERS([regex.h])
  if test "x$ac_cv_header_regex_h" != "xno"; then
    AC_CHECK_FUNC(regcomp)
    if test "x$ac_cv_func_regcomp" = xyes; then
      posix_regex_lib_found=1
    else
      AC_CHECK_LIB(regex,regcomp)
      if test "x$ac_cv_lib_regex_regcomp" = xyes; then
        posix_regex_lib_found=1
      fi
    fi
  fi
fi
if test -z $posix_regex_lib_found && (test "$enable_posix_regex_lib" = "auto" || test "$enable_posix_regex_lib" = "libpcreposix"); then
  AC_CHECK_HEADERS([pcreposix.h])
  AC_CHECK_LIB(pcreposix,regcomp)
  if test "x$ac_cv_lib_pcreposix_regcomp" != xyes; then
    AC_MSG_NOTICE(trying libpcreposix check again with libpcre)
	unset ac_cv_lib_pcreposix_regcomp
	AC_CHECK_LIB(pcre,pcre_exec)
    AC_CHECK_LIB(pcreposix,regcomp)
    if test "x$ac_cv_lib_pcre_pcre_exec" = xyes && test "x$ac_cv_lib_pcreposix_regcomp" = xyes; then
      AC_MSG_CHECKING(if PCRE_STATIC needs to be defined)
      AC_LINK_IFELSE(
        [AC_LANG_SOURCE(#include <pcreposix.h>
          int main() { return regcomp(NULL, NULL, 0); })],
        [without_pcre_static=yes],
        [without_pcre_static=no])
      AC_LINK_IFELSE(
        [AC_LANG_SOURCE(#define PCRE_STATIC
          #include <pcreposix.h>
          int main() { return regcomp(NULL, NULL, 0); })],
        [with_pcre_static=yes],
        [with_pcre_static=no])
      if test "x$without_pcre_static" != xyes && test "x$with_pcre_static" = xyes; then
        AC_MSG_RESULT(yes)
        AC_DEFINE([PCRE_STATIC], [1], [Define to 1 if PCRE_STATIC needs to be defined.])
      elif test "x$without_pcre_static" = xyes || test "x$with_pcre_static" = xyes; then
        AC_MSG_RESULT(no)
      fi
      posix_regex_lib_found=1
    fi
  else
    posix_regex_lib_found=1
  fi
fi

# TODO: Give the user the option of using a pre-existing system
# libarchive.  This will define HAVE_LIBARCHIVE which will cause
# bsdtar_platform.h to use #include <...> for the libarchive headers.
# Need to include Makefile.am magic to link against system
# -larchive in that case.
#AC_CHECK_LIB(archive,archive_version)

# Checks for supported compiler flags
AX_APPEND_COMPILE_FLAGS([-Wall -Wformat -Wformat-security])

# Place the functions and data into separate sections, allowing the linker
# to garbage collect the unused ones.
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--gc-sections"
AC_MSG_CHECKING([whether ld supports --gc-sections])
AC_LINK_IFELSE(
    [AC_LANG_SOURCE([static char UnusedFunc() { return 5; } int main() { return 0;}])],
    [AC_MSG_RESULT([yes])
        GC_SECTIONS="-Wl,--gc-sections";
        AX_APPEND_COMPILE_FLAGS([-ffunction-sections -fdata-sections])],
    [AC_MSG_RESULT([no])
        GC_SECTIONS="";])
LDFLAGS=$save_LDFLAGS

AC_SUBST(GC_SECTIONS)

# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
# la_TYPE_UID_T defaults to "int", which is incorrect for MinGW
# and MSVC. Use a customized version.
la_TYPE_UID_T
AC_TYPE_MODE_T
# AC_TYPE_OFF_T defaults to "long", which limits us to 4GB files on
# most systems... default to "long long" instead.
AC_CHECK_TYPE(off_t, [long long])
AC_TYPE_SIZE_T
AC_CHECK_TYPE(id_t, [unsigned long])
AC_CHECK_TYPE(uintptr_t, [unsigned int])

# Check for tm_gmtoff in struct tm
AC_CHECK_MEMBERS([struct tm.tm_gmtoff, struct tm.__tm_gmtoff],,,
[
#include <time.h>
])

# Check for f_namemax in struct statfs
AC_CHECK_MEMBERS([struct statfs.f_namemax],,,
[
#include <sys/param.h>
#include <sys/mount.h>
])

# Check for f_iosize in struct statfs
AC_CHECK_MEMBERS([struct statfs.f_iosize],,,
[
#include <sys/param.h>
#include <sys/mount.h>
])

# Check for f_iosize in struct statvfs
AC_CHECK_MEMBERS([struct statvfs.f_iosize],,,
[
#include <sys/statvfs.h>
])

# Check for birthtime in struct stat
AC_CHECK_MEMBERS([struct stat.st_birthtime])

# Check for high-resolution timestamps in struct stat
AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec])
AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec])
AC_CHECK_MEMBERS([struct stat.st_mtime_n]) # AIX
AC_CHECK_MEMBERS([struct stat.st_umtime]) # Tru64
AC_CHECK_MEMBERS([struct stat.st_mtime_usec]) # Hurd
# Check for block size support in struct stat
AC_CHECK_MEMBERS([struct stat.st_blksize])
# Check for st_flags in struct stat (BSD fflags)
AC_CHECK_MEMBERS([struct stat.st_flags])

# If you have uintmax_t, we assume printf supports %ju
# If you have unsigned long long, we assume printf supports %llu
# TODO: Check for %ju and %llu support directly.
AC_CHECK_TYPES([uintmax_t, unsigned long long])

# We use C99-style integer types
# Declare them if the local platform doesn't already do so.
AC_TYPE_INTMAX_T
AC_TYPE_UINTMAX_T
AC_TYPE_INT64_T
AC_TYPE_UINT64_T
AC_TYPE_INT32_T
AC_TYPE_UINT32_T
AC_TYPE_INT16_T
AC_TYPE_UINT16_T
AC_TYPE_UINT8_T

AC_CHECK_DECLS([SIZE_MAX, INT32_MAX, INT32_MIN])
AC_CHECK_DECLS([INT64_MAX, INT64_MIN, UINT64_MAX, UINT32_MAX])
AC_CHECK_DECLS([INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX])

AC_CHECK_DECL([SSIZE_MAX],
		[AC_DEFINE(HAVE_DECL_SSIZE_MAX, 1, [Define to 1 if you have the declaration of `SSIZE_MAX', and to 0 if you don't.])],
		[],
		[#include <limits.h>])

AC_CHECK_DECL([EFTYPE],
		[AC_DEFINE(HAVE_EFTYPE, 1, [A possible errno value for invalid file format errors])],
		[],
		[#include <errno.h>])
AC_CHECK_DECL([EILSEQ],
		[AC_DEFINE(HAVE_EILSEQ, 1, [A possible errno value for invalid file format errors])],
		[],
		[#include <errno.h>])
AC_CHECK_TYPE([wchar_t],
	        [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_[]wchar_t), 1, [Define to 1 if the system has the type `wchar_t'.])dnl
		AC_CHECK_SIZEOF([wchar_t])],
		[])

AX_COMPILE_CHECK_SIZEOF(int)
AX_COMPILE_CHECK_SIZEOF(long)

AC_CHECK_HEADERS_ONCE([sys/time.h])

# Checks for library functions.
AC_PROG_GCC_TRADITIONAL
AC_HEADER_MAJOR
AC_FUNC_FSEEKO
AC_FUNC_MEMCMP
AC_FUNC_LSTAT
AC_FUNC_STAT
AC_FUNC_STRERROR_R
AC_FUNC_STRFTIME
AC_FUNC_VPRINTF
# check for:
#   CreateHardLinkA(LPCSTR, LPCSTR, LPSECURITY_ATTRIBUTES)
# To avoid necessity for including windows.h or special forward declaration
# workarounds, we use 'void *' for 'struct SECURITY_ATTRIBUTES *'
AC_CHECK_STDCALL_FUNC([CreateHardLinkA],[const char *, const char *, void *])
AC_CHECK_FUNCS([arc4random_buf chflags chown chroot ctime_r])
AC_CHECK_FUNCS([fchdir fchflags fchmod fchown fcntl fdopendir fnmatch fork])
AC_CHECK_FUNCS([fstat fstatat fstatfs fstatvfs ftruncate])
AC_CHECK_FUNCS([futimens futimes futimesat])
AC_CHECK_FUNCS([geteuid getpid getgrgid_r getgrnam_r])
AC_CHECK_FUNCS([getpwnam_r getpwuid_r getvfsbyname gmtime_r])
AC_CHECK_FUNCS([lchflags lchmod lchown link linkat localtime_r lstat lutimes])
AC_CHECK_FUNCS([mbrtowc memmove memset])
AC_CHECK_FUNCS([mkdir mkfifo mknod mkstemp])
AC_CHECK_FUNCS([nl_langinfo openat pipe poll posix_spawnp readlink readlinkat])
AC_CHECK_FUNCS([readpassphrase])
AC_CHECK_FUNCS([select setenv setlocale sigaction statfs statvfs])
AC_CHECK_FUNCS([strchr strdup strerror strncpy_s strnlen strrchr symlink])
AC_CHECK_FUNCS([timegm tzset unlinkat unsetenv utime utimensat utimes vfork])
AC_CHECK_FUNCS([wcrtomb wcscmp wcscpy wcslen wctomb wmemcmp wmemcpy wmemmove])
AC_CHECK_FUNCS([_fseeki64 _get_timezone])
AC_CHECK_DECL([cmtime_s],
		[AC_DEFINE(HAVE_CMTIME_S, 1, [cmtime_s function])],
		[],
		[#include <time.h>])
AC_CHECK_DECL([gmtime_s],
		[AC_DEFINE(HAVE_GMTIME_S, 1, [gmtime_s function])],
		[],
		[#include <time.h>])
AC_CHECK_TYPE([localtime_s],
		[AC_DEFINE(HAVE_LOCALTIME_S, 1, [localtime_s function])],
		[],
		[#include <time.h>])
AC_CHECK_DECL([_mkgmtime],
		[AC_DEFINE(HAVE__MKGMTIME, 1, [_mkgmtime function])],
		[],
		[#include <time.h>])

# detects cygwin-1.7, as opposed to older versions
AC_CHECK_FUNCS([cygwin_conv_path])

# DragonFly uses vfsconf, FreeBSD xvfsconf.
AC_CHECK_TYPES(struct vfsconf,,,
	[#if HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#include <sys/mount.h>
	])

AC_CHECK_TYPES(struct xvfsconf,,,
	[#if HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#include <sys/mount.h>
	])

AC_CHECK_TYPES(struct statfs,,,
	[#if HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#include <sys/mount.h>
	])

# There are several variants of readdir_r around; we only
# accept the POSIX-compliant version.
AC_LINK_IFELSE(
 [AC_LANG_PROGRAM([[#include <dirent.h>]],
                  [[DIR *dir; struct dirent e, *r;
		    return(readdir_r(dir, &e, &r));]])],
 [AC_DEFINE(HAVE_READDIR_R,1,[Define to 1 if you have a POSIX compatible readdir_r])]
)
# dirfd can be either a function or a macro.
AC_LINK_IFELSE(
 [AC_LANG_PROGRAM([[#include <dirent.h>
                    DIR *dir;]],
                  [[return(dirfd(dir));]])],
 [AC_DEFINE(HAVE_DIRFD,1,[Define to 1 if you have a dirfd function or macro])]
)

# FreeBSD's nl_langinfo supports an option to specify whether the
# current locale uses month/day or day/month ordering.  It makes the
# output a little prettier...
AC_CHECK_DECL([D_MD_ORDER],
[AC_DEFINE(HAVE_D_MD_ORDER, 1, [Define to 1 if nl_langinfo supports D_MD_ORDER])],
[],
[#if HAVE_LANGINFO_H
#include <langinfo.h>
#endif
])

# Check for dirent.d_namlen field explicitly
# (This is a bit more straightforward than, if not quite as portable as,
# the recipe given by the autoconf maintainers.)
AC_CHECK_MEMBER(struct dirent.d_namlen,,,
[#if HAVE_DIRENT_H
#include <dirent.h>
#endif
])

AC_CHECK_DECL([optreset],
		[AC_DEFINE(HAVE_GETOPT_OPTRESET, 1, [Platform uses optreset to reset getopt])],
		[],
		[#include <getopt.h>])

# Check for Extended Attributes support
AC_ARG_ENABLE([xattr],
		AS_HELP_STRING([--disable-xattr],
		[Disable Extended Attributes support (default: check)]))

if test "x$enable_xattr" != "xno"; then
    AC_SEARCH_LIBS([setxattr], [attr gnu])
    AC_CHECK_DECLS([EXTATTR_NAMESPACE_USER], [], [], [#include <sys/types.h>
#include <sys/extattr.h>
])
    AC_CHECK_DECLS([XATTR_NOFOLLOW], [], [], [#include <sys/xattr.h>
])
    if test "x$ac_cv_header_sys_xattr_h" = "xyes" \
	 -a "x$ac_cv_have_decl_XATTR_NOFOLLOW" = "xyes"; then
	# Darwin extended attributes support
	AC_CACHE_VAL([ac_cv_archive_xattr_darwin],
	  [AC_CHECK_FUNCS(fgetxattr \
			  flistxattr \
			  fsetxattr \
			  getxattr \
			  listxattr \
			  setxattr,
	  [ac_cv_archive_xattr_darwin=yes],
	  [ac_cv_archive_xattr_darwin=no],
	  [#include <sys/xattr.h>
])
	]
      )
    elif test "x$ac_cv_header_sys_extattr_h" = "xyes" \
           -a "x$ac_cv_have_decl_EXTATTR_NAMESPACE_USER" = "xyes"; then
	# FreeBSD extended attributes support
	AC_CACHE_VAL([ac_cv_archive_xattr_freebsd],
	  [AC_CHECK_FUNCS(extattr_get_fd \
			  extattr_get_file \
			  extattr_get_link \
			  extattr_list_fd \
			  extattr_list_file \
			  extattr_list_link \
			  extattr_set_fd \
			  extattr_set_link,
	  [ac_cv_archive_xattr_freebsd=yes],
	  [ac_cv_archive_xattr_freebsd=no],
	  [#include <sys/types.h>
#include <sys/extattr.h>
])
	  ]
	)
    elif test "x$ac_cv_header_sys_xattr_h" = "xyes" \
	   -o "x$ac_cv_header_attr_xattr_h" = "xyes"; then
	# Linux extended attributes support
	AC_CACHE_VAL([ac_cv_archive_xattr_linux],
	  [AC_CHECK_FUNCS(fgetxattr \
			  flistxattr \
			  fsetxattr \
			  getxattr \
			  lgetxattr \
			  listxattr \
			  llistxattr \
			  lsetxattr,
	  [ac_cv_archive_xattr_linux=yes],
	  [ac_cv_archive_xattr_linux=no],
	  [#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_XATTR_H
#include <sys/xattr.h>
#endif
#if HAVE_ATTR_XATTR_H
#include <attr/xatr.h>
#endif
])
	]
      )
    elif test "x$ac_cv_header_sys_ea_h" = "xyes"; then
	# AIX extended attributes support
	AC_CACHE_VAL([ac_cv_archive_xattr_aix],
	  [AC_CHECK_FUNCS(fgetea \
			  flistea \
			  fsetea \
			  getea \
			  lgetea \
			  listea \
			  llistea \
			  lsetea,
	  [ac_cv_archive_xattr_aix=yes],
	  [ac_cv_archive_xattr_aix=no],
	  [#include <sys/ea.h>
])
	  ]
	)
    fi

    AC_MSG_CHECKING([for extended attributes support])
    if test "x$ac_cv_archive_xattr_linux" = "xyes"; then
	AC_DEFINE([ARCHIVE_XATTR_LINUX], [1], [Linux xattr support])
	AC_MSG_RESULT([Linux])
    elif test "x$ac_cv_archive_xattr_darwin" = "xyes"; then
	AC_DEFINE([ARCHIVE_XATTR_DARWIN], [1], [Darwin xattr support])
	AC_MSG_RESULT([Darwin])
    elif test "x$ac_cv_archive_xattr_freebsd" = "xyes"; then
	AC_DEFINE([ARCHIVE_XATTR_FREEBSD], [1], [FreeBSD xattr support])
	AC_MSG_RESULT([FreeBSD])
    elif test "x$ac_cv_archive_xattr_aix" = "xyes"; then
	AC_DEFINE([ARCHIVE_XATTR_AIX], [1], [AIX xattr support])
	AC_MSG_RESULT([AIX])
    else
	AC_MSG_RESULT([none])
    fi
fi

# Check for ACL support
#
# The ACL support in libarchive is written against the POSIX1e draft,
# which was never officially approved and varies quite a bit across
# platforms.  Worse, some systems have completely non-POSIX acl functions,
# which makes the following checks rather more complex than I would like.
#
AC_ARG_ENABLE([acl],
		AS_HELP_STRING([--disable-acl],
		[Disable ACL support (default: check)]))

if test "x$enable_acl" != "xno"; then
    # Libacl
    AC_CHECK_LIB([acl], [acl_get_file])

    AC_CHECK_TYPES([acl_t, acl_entry_t, acl_permset_t, acl_tag_t], [], [], [
      #if HAVE_SYS_TYPES_H
      #include <sys/types.h>
      #endif
      #if HAVE_SYS_ACL_H
      #include <sys/acl.h>
      #endif
    ])

    AC_CHECK_LIB([richacl], [richacl_get_file])

    AC_CHECK_TYPES([[struct richace], [struct richacl]], [], [], [
      #if HAVE_SYS_RICHACL_H
      #include <sys/richacl.h>
      #endif
    ])

    # Solaris and derivates ACLs
    AC_CHECK_FUNCS(acl facl)

    if test "x$ac_cv_lib_richacl_richacl_get_file" = "xyes" \
	 -a "x$ac_cv_type_struct_richace" = "xyes" \
	 -a "x$ac_cv_type_struct_richacl" = "xyes"; then
	AC_CACHE_VAL([ac_cv_archive_acl_librichacl],
	  [AC_CHECK_FUNCS(richacl_alloc \
			  richacl_equiv_mode \
			  richacl_free \
			  richacl_get_fd \
			  richacl_get_file \
			  richacl_set_fd \
			  richacl_set_file,
	  [ac_cv_archive_acl_librichacl=yes], [ac_cv_archive_acl_librichacl=no],	  [#include <sys/richacl.h>])])
    fi

    if test "x$ac_cv_func_acl" = "xyes" \
	 -a "x$ac_cv_func_facl" = "xyes"; then
	AC_CHECK_TYPES([aclent_t], [], [], [[#include <sys/acl.h>]])
	if test "x$ac_cv_type_aclent_t" = "xyes"; then
	    AC_CACHE_VAL([ac_cv_archive_acl_sunos],
	      [AC_CHECK_DECLS([GETACL, SETACL, GETACLCNT],
	      [ac_cv_archive_acl_sunos=yes], [ac_cv_archive_acl_sunos=no],
	      [#include <sys/acl.h>])])
	    AC_CHECK_TYPES([ace_t], [], [], [[#include <sys/acl.h>]])
	    if test "x$ac_cv_type_ace_t" = "xyes"; then
		AC_CACHE_VAL([ac_cv_archive_acl_sunos_nfs4],
		  [AC_CHECK_DECLS([ACE_GETACL, ACE_SETACL, ACE_GETACLCNT],
		  [ac_cv_archive_acl_sunos_nfs4=yes],
		  [ac_cv_archive_acl_sonos_nfs4=no],
		  [#include <sys/acl.h>])])
	    fi
	fi
    elif test "x$ac_cv_type_acl_t" = "xyes" \
	 -a "x$ac_cv_type_acl_entry_t" = "xyes" \
	 -a "x$ac_cv_type_acl_permset_t" = "xyes" \
	 -a "x$ac_cv_type_acl_tag_t" = "xyes"; then
	# POSIX.1e ACL functions
	AC_CACHE_VAL([ac_cv_posix_acl_funcs],
	  [AC_CHECK_FUNCS(acl_add_perm \
			  acl_clear_perms \
			  acl_create_entry \
			  acl_delete_def_file \
			  acl_free \
			  acl_get_entry \
			  acl_get_fd \
			  acl_get_file \
			  acl_get_permset \
			  acl_get_qualifier \
			  acl_get_tag_type \
			  acl_init \
			  acl_set_fd \
			  acl_set_file \
			  acl_set_qualifier \
			  acl_set_tag_type,
	  [ac_cv_posix_acl_funcs=yes], [ac_cv_posix_acl_funcs=no],
	  [#if HAVE_SYS_TYPES_H
	   #include <sys/types.h>
	   #endif
	   #if HAVE_SYS_ACL_H
	   #include <sys/acl.h>
	   #endif
	  ])
	])

	AC_CHECK_FUNCS(acl_get_perm)

	if test "x$ac_cv_posix_acl_funcs" = "xyes" \
	     -a "x$ac_cv_header_acl_libacl_h" = "xyes" \
	     -a "x$ac_cv_lib_acl_acl_get_file" = "xyes" \
	     -a "x$ac_cv_func_acl_get_perm"; then
	    AC_CACHE_VAL([ac_cv_archive_acl_libacl],
	      [ac_cv_archive_acl_libacl=yes])
	    AC_DEFINE([ARCHIVE_ACL_LIBACL], [1],
	      [POSIX.1e ACL support via libacl])
	else
	     # FreeBSD/Darwin
	     AC_CHECK_FUNCS(acl_add_flag_np \
			    acl_clear_flags_np \
			    acl_get_brand_np \
			    acl_get_entry_type_np \
			    acl_get_flag_np \
			    acl_get_flagset_np \
			    acl_get_fd_np \
			    acl_get_link_np \
			    acl_get_perm_np \
			    acl_is_trivial_np \
			    acl_set_entry_type_np \
			    acl_set_fd_np \
			    acl_set_link_np,,,
	      [#include <sys/types.h>
	       #include <sys/acl.h>])

	    AC_CHECK_FUNCS(mbr_uid_to_uuid \
			   mbr_uuid_to_id \
			   mbr_gid_to_uuid,,,
	      [#include <membership.h>])

	    AC_CHECK_DECLS([ACL_TYPE_EXTENDED, ACL_TYPE_NFS4, ACL_USER,
	      ACL_SYNCHRONIZE], [], [],
	      [#include <sys/types.h>
	       #include <sys/acl.h>])
	    if test "x$ac_cv_posix_acl_funcs" = "xyes" \
	         -a "x$ac_cv_func_acl_get_fd_np" = "xyes" \
                 -a "x$ac_cv_func_acl_get_perm" != "xyes" \
	         -a "x$ac_cv_func_acl_get_perm_np" = "xyes" \
	         -a "x$ac_cv_func_acl_set_fd_np" = "xyes"; then
		if test "x$ac_cv_have_decl_ACL_USER" = "xyes"; then
		    AC_CACHE_VAL([ac_cv_archive_acl_freebsd],
		      [ac_cv_archive_acl_freebsd=yes])
		    if test "x$ac_cv_have_decl_ACL_TYPE_NFS4" = "xyes" \
		         -a "x$ac_cv_func_acl_add_flag_np" = "xyes" \
		         -a "x$ac_cv_func_acl_get_brand_np" = "xyes" \
		         -a "x$ac_cv_func_acl_get_entry_type_np" = "xyes" \
		         -a "x$ac_cv_func_acl_get_flagset_np" = "xyes" \
		         -a "x$ac_cv_func_acl_set_entry_type_np" = "xyes"; then
			AC_CACHE_VAL([ac_cv_archive_acl_freebsd_nfs4],
			  [ac_cv_archive_acl_freebsd_nfs4=yes])
		    fi
	        elif test "x$ac_cv_have_decl_ACL_TYPE_EXTENDED" = "xyes" \
		       -a "x$ac_cv_func_acl_add_flag_np" = "xyes" \
		       -a "x$ac_cv_func_acl_get_flagset_np" = "xyes" \
		       -a "x$ac_cv_func_acl_get_link_np" = "xyes" \
		       -a "x$ac_cv_func_acl_set_link_np" = "xyes" \
		       -a "x$ac_cv_func_mbr_uid_to_uuid" = "xyes" \
		       -a "x$ac_cv_func_mbr_uuid_to_id" = "xyes" \
		       -a "x$ac_cv_func_mbr_gid_to_uuid" = "xyes"; then
		    AC_CACHE_VAL([ac_cv_archive_acl_darwin],
		      [ac_cv_archive_acl_darwin=yes])
	        fi
	    fi
	fi
    fi
    AC_MSG_CHECKING([for ACL support])
    if test "x$ac_cv_archive_acl_libacl" = "xyes" \
	 -a "x$ac_cv_archive_acl_librichacl" = "xyes"; then
	AC_MSG_RESULT([libacl (POSIX.1e) + librichacl (NFSv4)])
	AC_DEFINE([ARCHIVE_ACL_LIBACL], [1],
	  [Linux POSIX.1e ACL support via libacl])
	AC_DEFINE([ARCHIVE_ACL_LIBRICHACL], [1],
	  [Linux NFSv4 ACL support via librichacl])
    elif test "x$ac_cv_archive_acl_libacl" = "xyes"; then
	AC_MSG_RESULT([libacl (POSIX.1e)])
	AC_DEFINE([ARCHIVE_ACL_LIBACL], [1],
	  [Linux POSIX.1e ACL support via libacl])
    elif test "x$ac_cv_archive_acl_librichacl" = "xyes"; then
	AC_MSG_RESULT([librichacl (NFSv4)])
	AC_DEFINE([ARCHIVE_ACL_LIBRICHACL], [1],
	  [Linux NFSv4 ACL support via librichacl])
    elif test "x$ac_cv_archive_acl_darwin" = "xyes"; then
	AC_DEFINE([ARCHIVE_ACL_DARWIN], [1], [Darwin ACL support])
	AC_MSG_RESULT([Darwin (limited NFSv4)])
    elif test "x$ac_cv_archive_acl_sunos" = "xyes"; then
	AC_DEFINE([ARCHIVE_ACL_SUNOS], [1], [Solaris ACL support])
	if test "x$ac_cv_archive_acl_sunos_nfs4" = "xyes"; then
	    AC_DEFINE([ARCHIVE_ACL_SUNOS_NFS4], [1],
	      [Solaris NFSv4 ACL support])
	    AC_MSG_RESULT([Solaris (POSIX.1e and NFSv4)])
	else
	    AC_MSG_RESULT([Solaris (POSIX.1e)])
	fi
    elif test "x$ac_cv_archive_acl_freebsd" = "xyes"; then
	AC_DEFINE([ARCHIVE_ACL_FREEBSD], [1], [FreeBSD ACL support])
	if test "x$ac_cv_archive_acl_freebsd_nfs4" = "xyes"; then
	    AC_DEFINE([ARCHIVE_ACL_FREEBSD_NFS4], [1],
	      [FreeBSD NFSv4 ACL support])
	    AC_MSG_RESULT([FreeBSD (POSIX.1e and NFSv4)])
	else
	    AC_MSG_RESULT([FreeBSD (POSIX.1e)])
	fi
    else
	AC_MSG_RESULT([none])
    fi
fi


AM_CONDITIONAL([INC_LINUX_ACL],
  [test "x$ac_cv_archive_acl_libacl" = "xyes" \
     -o "x$ac_cv_archive_acl_librichacl" = "xyes"])
AM_CONDITIONAL([INC_SUNOS_ACL], [test "x$ac_cv_archive_acl_sunos" = "xyes"])
AM_CONDITIONAL([INC_DARWIN_ACL],
	  [test "x$ac_cv_archive_acl_darwin" = "xyes"])
AM_CONDITIONAL([INC_FREEBSD_ACL],
	  [test "x$ac_cv_archive_acl_freebsd" = "xyes"])

# Additional requirements
AC_SYS_LARGEFILE

dnl NOTE: Crypto checks must run last.
AC_DEFUN([CRYPTO_CHECK], [
  if test "$found_$1" != yes; then
    saved_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$CPPFLAGS -I. -I$srcdir -I$srcdir/libarchive"
    touch "check_crypto_md.h"
    AC_MSG_CHECKING([support for ARCHIVE_CRYPTO_$1_$2])
    AC_LINK_IFELSE([AC_LANG_SOURCE([
#define ARCHIVE_$1_COMPILE_TEST
#define ARCHIVE_CRYPTO_$1_$2
#define PLATFORM_CONFIG_H "check_crypto_md.h"

$(cat "$srcdir/libarchive/archive_digest.c")

int
main(int argc, char **argv)
{
  archive_$3_ctx ctx;
  archive_$3_init(&ctx);
  archive_$3_update(&ctx, *argv, argc);
  archive_$3_final(&ctx, NULL);
  return 0;
}
])],
    [ AC_MSG_RESULT([yes])
      found_$1=yes
      found_$2=yes
      AC_DEFINE(ARCHIVE_CRYPTO_$1_$2, 1, [ $1 via ARCHIVE_CRYPTO_$1_$2 supported.])
    ],
    [ AC_MSG_RESULT([no])])
    CPPFLAGS="$saved_CPPFLAGS"
    rm "check_crypto_md.h"
  fi
])

AC_DEFUN([CRYPTO_CHECK_WIN], [
  if test "$found_$1" != yes; then
    AC_MSG_CHECKING([support for ARCHIVE_CRYPTO_$1_WIN])
    AC_LINK_IFELSE([AC_LANG_SOURCE([
#define ARCHIVE_$1_COMPILE_TEST
#include <windows.h>
#include <wincrypt.h>

int
main(int argc, char **argv)
{
	(void)argc;
	(void)argv;

	return ($2);
}
])],
    [ AC_MSG_RESULT([yes])
      found_$1=yes
      found_WIN=yes
      AC_DEFINE(ARCHIVE_CRYPTO_$1_WIN, 1, [ $1 via ARCHIVE_CRYPTO_$1_WIN supported.])
    ],
    [ AC_MSG_RESULT([no])])
  fi
])

case "$host_os" in
  *mingw* | *cygwin* | *msys*)
	;;
  *)
	CRYPTO_CHECK(MD5, LIBC, md5)
	CRYPTO_CHECK(MD5, LIBSYSTEM, md5)
	CRYPTO_CHECK(RMD160, LIBC, rmd160)
	CRYPTO_CHECK(SHA1, LIBC, sha1)
	CRYPTO_CHECK(SHA1, LIBSYSTEM, sha1)
	CRYPTO_CHECK(SHA256, LIBC, sha256)
	CRYPTO_CHECK(SHA256, LIBC2, sha256)
	CRYPTO_CHECK(SHA256, LIBC3, sha256)
	CRYPTO_CHECK(SHA256, LIBSYSTEM, sha256)
	CRYPTO_CHECK(SHA384, LIBC, sha384)
	CRYPTO_CHECK(SHA384, LIBC2, sha384)
	CRYPTO_CHECK(SHA384, LIBC3, sha384)
	CRYPTO_CHECK(SHA384, LIBSYSTEM, sha384)
	CRYPTO_CHECK(SHA512, LIBC, sha512)
	CRYPTO_CHECK(SHA512, LIBC2, sha512)
	CRYPTO_CHECK(SHA512, LIBC3, sha512)
	CRYPTO_CHECK(SHA512, LIBSYSTEM, sha512)
	;;
esac

if test "x$with_cng" != "xno"; then
    AC_CHECK_HEADERS([bcrypt.h],[
        LIBS="$LIBS -lbcrypt"
    ],[],
    [[#ifdef HAVE_WINDOWS_H
    # include <windows.h>
    #endif
    ]])
fi

if test "x$with_mbedtls" = "xyes"; then
    AC_CHECK_HEADERS([mbedtls/aes.h mbedtls/md.h mbedtls/pkcs5.h])
    saved_LIBS=$LIBS
    AC_CHECK_LIB(mbedcrypto,mbedtls_sha1_init)
    CRYPTO_CHECK(MD5, MBEDTLS, md5)
    CRYPTO_CHECK(RMD160, MBEDTLS, rmd160)
    CRYPTO_CHECK(SHA1, MBEDTLS, sha1)
    CRYPTO_CHECK(SHA256, MBEDTLS, sha256)
    CRYPTO_CHECK(SHA384, MBEDTLS, sha384)
    CRYPTO_CHECK(SHA512, MBEDTLS, sha512)
    if test "x$found_MBEDTLS" != "xyes"; then
      LIBS=$saved_LIBS
    fi
fi

if test "x$with_nettle" = "xyes"; then
    AC_CHECK_HEADERS([nettle/md5.h nettle/ripemd160.h nettle/sha.h])
    AC_CHECK_HEADERS([nettle/pbkdf2.h nettle/aes.h nettle/hmac.h])
    saved_LIBS=$LIBS
    AC_CHECK_LIB(nettle,nettle_sha1_init)
    CRYPTO_CHECK(MD5, NETTLE, md5)
    CRYPTO_CHECK(RMD160, NETTLE, rmd160)
    CRYPTO_CHECK(SHA1, NETTLE, sha1)
    CRYPTO_CHECK(SHA256, NETTLE, sha256)
    CRYPTO_CHECK(SHA384, NETTLE, sha384)
    CRYPTO_CHECK(SHA512, NETTLE, sha512)
    if test "x$found_NETTLE" != "xyes"; then
      LIBS=$saved_LIBS
    fi
fi

if test "x$with_openssl" != "xno"; then
    AC_CHECK_HEADERS([openssl/evp.h])
    saved_LIBS=$LIBS
    LIBSREQUIRED="$LIBSREQUIRED${LIBSREQUIRED:+ }libcrypto"
    AC_CHECK_LIB(crypto,OPENSSL_config)
    CRYPTO_CHECK(MD5, OPENSSL, md5)
    CRYPTO_CHECK(RMD160, OPENSSL, rmd160)
    CRYPTO_CHECK(SHA1, OPENSSL, sha1)
    CRYPTO_CHECK(SHA256, OPENSSL, sha256)
    CRYPTO_CHECK(SHA384, OPENSSL, sha384)
    CRYPTO_CHECK(SHA512, OPENSSL, sha512)
    AC_CHECK_FUNCS([PKCS5_PBKDF2_HMAC_SHA1])
fi

AC_SUBST(LIBSREQUIRED)

# Probe libmd AFTER OpenSSL/libcrypto.
# The two are incompatible and OpenSSL is more complete.
AC_CHECK_HEADERS([md5.h ripemd.h sha.h sha256.h sha512.h])
saved_LIBS=$LIBS
AC_CHECK_LIB(md,MD5Init)
CRYPTO_CHECK(MD5, LIBMD, md5)
CRYPTO_CHECK(RMD160, LIBMD, rmd160)
CRYPTO_CHECK(SHA1, LIBMD, sha1)
CRYPTO_CHECK(SHA256, LIBMD, sha256)
CRYPTO_CHECK(SHA512, LIBMD, sha512)
if test "x$found_LIBMD" != "xyes"; then
  LIBS=$saved_LIBS
fi

case "$host_os" in
  *mingw* | *cygwin* | *msys*)
	CRYPTO_CHECK_WIN(MD5, CALG_MD5)
	CRYPTO_CHECK_WIN(SHA1, CALG_SHA1)
	CRYPTO_CHECK_WIN(SHA256, CALG_SHA_256)
	CRYPTO_CHECK_WIN(SHA384, CALG_SHA_384)
	CRYPTO_CHECK_WIN(SHA512, CALG_SHA_512)
	;;
esac

dnl Visibility annotations...
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
AC_MSG_CHECKING(whether compiler supports visibility annotations)
AC_LINK_IFELSE([AC_LANG_PROGRAM([
                 int foo( void ) __attribute__((visibility("default")));
               ])],
               [CFLAGS="$saved_CFLAGS -fvisibility=hidden -D__LIBARCHIVE_ENABLE_VISIBILITY";
                AC_MSG_RESULT(yes)],
               [CFLAGS="$saved_CFLAGS"
                AC_MSG_RESULT(no)])

# Ensure test directories are present if building out-of-tree
AC_CONFIG_COMMANDS([mkdirs],
		   [mkdir -p libarchive/test tar/test cat/test cpio/test])

AC_OUTPUT