[iptables PATCH] configure: make libmnl and libnftnl hard requirements

[Giuseppe Longo <giuseppelng@gmail.com>]

From: Giuseppe Longo <giuseppelng@gmail.com>

Iptables building is broken if either libmnl orlibnftnl
is not installed on the system.

Configure script actually checks if libmnl and libnftnl are installed,
but doesn't exit if they are not.

Signed-off-by: Giuseppe Longo <giuseppelng@gmail.com>
---
 configure.ac | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/configure.ac b/configure.ac
index 12bffa9..b170add 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,8 +122,26 @@ AM_CONDITIONAL([HAVE_LIBNFNETLINK], [test "$nfnetlink" = 1])
 if test "x$enable_nftables" = "xyes"; then
 	PKG_CHECK_MODULES([libmnl], [libmnl >= 1.0], [mnl=1], [mnl=0])
 
+	if test "$mnl" = 0;
+	then
+		echo "*** Error: No suitable libmnl found. ***"
+		echo "    Please install the 'libmnl' package"
+		echo "    Or consider --disable-nftables to skip"
+		echo "    iptables-compat over nftables support."
+		exit 1
+	fi
+
 	PKG_CHECK_MODULES([libnftnl], [libnftnl >= 1.0.5], [nftables=1], [nftables=0])
 
+	if test "$nftables" = 0;
+	then
+		echo "*** Error: no suitable libnftnl found. ***"
+		echo "    Please install the 'libnftnl' package"
+		echo "    Or consider --disable-nftables to skip"
+		echo "    iptables-compat over nftables support."
+		exit 1
+	fi
+
 	AM_PROG_LEX
 	AC_PROG_YACC
 
-- 
2.5.0