netsniff-ng: needs -fcommon for gcc10

[ci skip]

srcpkgs/netsniff-ng/template

@@ -14,6 +14,8 @@ homepage="http://netsniff-ng.org/"
 distfiles="http://pub.netsniff-ng.org/netsniff-ng/netsniff-ng-${version}.tar.gz"
 checksum=0a7092937209585b361400493d81ea1123a529494203824c0cd8e95562072c5e
 
+CFLAGS="-fcommon"
+
 post_extract() {
 	vsed -i "s|/sbin|/bin|g" Makefile
 }
@@ -24,6 +26,9 @@ pre_configure() {
 	export NACL_LIB_DIR=${XBPS_CROSS_BASE}/usr/lib
 }
 
+do_build() {
+	make ${makejobs} CC="${CC}" LD="${CC}" CFLAGS="${CFLAGS}" LDFLAGS="${LDFLAGS}"
+}
 
 pre_install() {
 	vmkdir usr/bin