configure: Call a function from zlib in check_zlib()

In order to cause the linker to get called and thus the check for the
presence of the library (not just the headers) to be performed, call
gzopen(). Also pass the proper linker flags to $CC.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 3 insertions, 1 deletions

diff --git a/configure b/configure
index 74e1c14..6f5b54b 100755
--- a/configure
+++ b/configure
@@ -233,10 +233,12 @@ check_zlib()
 void main(void)
 {
 	gzFile fp;
+
+	fp = gzopen("foo.gz", "rb");
 }
 EOF
 
-	$CC -o $TMPDIR/ztest $TMPDIR/ztest.c >> $TMPDIR/config.log 2>&1
+	$CC -o $TMPDIR/ztest $TMPDIR/ztest.c -lz >> $TMPDIR/config.log 2>&1
 	if [ ! -x $TMPDIR/ztest ] ; then
 		echo "[NO]"
 		MISSING_DEFS=1