Detect libpcap dependencies using pkg-config

When building statically the link command line must include all
dependencies of all libraries. libpcap can optionally depend on libnl.
mausezahn can't build statically in this case.

Use pkg-config in configure and in the link command to construct the
library flags we need to link with libpcap.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 3 insertions, 1 deletions

diff --git a/configure b/configure
index 510826a..598ae24 100755
--- a/configure
+++ b/configure
@@ -588,7 +588,9 @@ int main(void)
 }
 EOF
 
-	$CC -o $TMPDIR/pcaptest $TMPDIR/pcaptest.c -lpcap >> config.log 2>&1
+	$CC -o $TMPDIR/pcaptest $TMPDIR/pcaptest.c \
+		$($PKG_CONFIG --libs libpcap 2>> config.log) \
+		>> config.log 2>&1
 	if [ ! -x $TMPDIR/pcaptest ] ; then
 		echo "[NO]"
 		echo "CONFIG_LIBPCAP=0" >> Config