l2tpv3 (configure): it is linux-specific
Some non-linux systems, for example a system with
FreeBSD kernel and glibc, may declare struct mmsghdr
(in glibc) but may not have linux-specific header
file linux/ip.h. The actual implementation in qemu
includes this linux-specific header file unconditionally,
so compilation fails if it is not present. Include
this header in the configure test too.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/configure b/configure
index f7685b5..f49e618 100755
--- a/configure
+++ b/configure
@@ -1723,6 +1723,7 @@
cat > $TMPC <<EOF
#include <sys/socket.h>
+#include <linux/ip.h>
int main(void) { return sizeof(struct mmsghdr); }
EOF
if compile_prog "" "" ; then
