configure: conditional dependencies for nftables-compat

Depend on libmnl, libnftnl, flex and bison if only if the nftables
compatibility is enabled.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/configure.ac b/configure.ac
index 54f1fd5b6d59a9f445ca1a1b837700b1d108c139..2521ccc82898d55aa74be83e5c47ea773815a94a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -119,44 +119,45 @@ PKG_CHECK_MODULES([libnfnetlink], [libnfnetlink >= 1.0],
        [nfnetlink=1], [nfnetlink=0])
 AM_CONDITIONAL([HAVE_LIBNFNETLINK], [test "$nfnetlink" = 1])
 
-PKG_CHECK_MODULES([libmnl], [libmnl >= 1.0],
-       [mnl=1], [mnl=0])
-AM_CONDITIONAL([HAVE_LIBMNL], [test "$mnl" = 1])
-
-PKG_CHECK_MODULES([libnftnl], [libnftnl >= 1.0],
-       [nftables=1], [nftables=0])
-AM_CONDITIONAL([HAVE_LIBNFTNL], [test "$nftables" = 1])
-
-AM_PROG_LEX
-AC_PROG_YACC
-
-if test -z "$ac_cv_prog_YACC"
-then
-       echo "*** Error: No suitable bison/yacc found. ***"
-       echo "    Please install the 'bison' package."
-       exit 1
-fi
-if test -z "$ac_cv_prog_LEX"
-then
-        echo "*** Error: No suitable flex/lex found. ***"
-        echo "    Please install the 'flex' package."
-        exit 1
+if test "x$enable_nftables" = "xyes"; then
+       PKG_CHECK_MODULES([libmnl], [libmnl >= 1.0], [mnl=1], [mnl=0])
+
+       PKG_CHECK_MODULES([libnftnl], [libnftnl >= 1.0], [nftables=1], [nftables=0])
+
+       AM_PROG_LEX
+       AC_PROG_YACC
+
+       if test -z "$ac_cv_prog_YACC"
+       then
+               echo "*** Error: No suitable bison/yacc found. ***"
+               echo "    Please install the 'bison' package."
+               exit 1
+       fi
+       if test -z "$ac_cv_prog_LEX"
+       then
+               echo "*** Error: No suitable flex/lex found. ***"
+               echo "    Please install the 'flex' package."
+               exit 1
+       fi
+
+       AC_MSG_CHECKING(flex version)
+       flex_version=`$ac_cv_prog_LEX --version | sed 's/version//g' | awk '/flex/ {print $2}'`
+       flex_major=`echo $flex_version| cut -d . -f 1`
+       flex_minor=`echo $flex_version| cut -d . -f 2`
+       flex_rev=`echo $flex_version| cut -d . -f 3`
+
+       if test "$flex_major" -eq "2" && test "$flex_minor" -eq "5" && test "$flex_rev" -ge "33"; then
+               AC_MSG_RESULT([$flex_version. OK])
+       else
+               AC_MSG_WARN([flex version $flex_version found.
+               Version 2.5.33 or greater is required. You may experience problems
+               while compilating the nftables compatibility layer for iptables.
+               Please, consider to upgrade flex.])
+       fi
 fi
 
-AC_MSG_CHECKING(flex version)
-flex_version=`$ac_cv_prog_LEX --version | sed 's/version//g' | awk '/flex/ {print $2}'`
-flex_major=`echo $flex_version| cut -d . -f 1`
-flex_minor=`echo $flex_version| cut -d . -f 2`
-flex_rev=`echo $flex_version| cut -d . -f 3`
-
-if test "$flex_major" -eq "2" && test "$flex_minor" -eq "5" && test "$flex_rev" -ge "33"; then
-       AC_MSG_RESULT([$flex_version. OK])
-else
-       AC_MSG_WARN([flex version $flex_version found.
-       Version 2.5.33 or greater is required. You may experience problems
-       while compilating the nftables compatibility layer for iptables.
-       Please, consider to upgrade flex.])
-fi
+AM_CONDITIONAL([HAVE_LIBMNL], [test "$mnl" = 1])
+AM_CONDITIONAL([HAVE_LIBNFTNL], [test "$nftables" = 1])
 
 regular_CFLAGS="-Wall -Waggregate-return -Wmissing-declarations \
        -Wmissing-prototypes -Wredundant-decls -Wshadow -Wstrict-prototypes \