build: fix autoconf warnings

autoconf complains about three obsolete macros.

`AC_CONFIG_HEADER` has been superseded by `AC_CONFIG_HEADERS`, so
replace it.

`AM_PROG_LEX` calls `AC_PROG_LEX` with no arguments, but this usage is
deprecated.  The only difference between `AM_PROG_LEX` and `AC_PROG_LEX`
is that the former defines `$LEX` as "./build-aux/missing lex" if no lex
is found to ensure a useful error is reported when make is run.  How-
ever, the configure script checks that we have a working lex and exits
with an error if none is available, so `$LEX` will never be called and
we can replace `AM_PROG_LEX` with `AC_PROG_LEX`.

`AM_PROG_LIBTOOL` has been superseded by `LT_INIT`, which is already in
configure.ac, so remove it.

We can also replace `AC_DISABLE_STATIC` with an argument to `LT_INIT`.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/configure.ac b/configure.ac
index bb65f749691c04f810f1e9392c9d010a941d37b2..503883f28c664b5df31324a29308d8b11dba4ba3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,7 @@ AM_INIT_AUTOMAKE([-Wall foreign subdir-objects
 dnl kernel style compile messages
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
-AC_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 
 AC_ARG_ENABLE([debug],
              AS_HELP_STRING([--disable-debug], [Disable debugging symbols]),
@@ -26,7 +26,7 @@ AC_PROG_CC
 AC_PROG_MKDIR_P
 AC_PROG_INSTALL
 AC_PROG_SED
-AM_PROG_LEX
+AC_PROG_LEX([noyywrap])
 AC_PROG_YACC
 
 if test -z "$ac_cv_prog_YACC" -a ! -f "${srcdir}/src/parser_bison.c"
@@ -43,11 +43,9 @@ then
 fi
 
 AM_PROG_AR
-AM_PROG_LIBTOOL
-LT_INIT
+LT_INIT([disable-static])
 AM_PROG_CC_C_O
 AC_EXEEXT
-AC_DISABLE_STATIC
 CHECK_GCC_FVISIBILITY
 
 AS_IF([test "x$enable_man_doc" = "xyes"], [