Index: conf/configure.in.nse
--- conf/configure.in.nse.orig
+++ conf/configure.in.nse
@@ -79,13 +79,10 @@ AC_TRY_COMPILE([
 #include <stdio.h>
 #include <netinet/tcp.h>
 ], [
-int main()
-{
 	struct tcphdr *tcp;
 	tcp->source= 1;
 
 	return 0;
-}
 ], [
 V_DEFINE="$V_DEFINE -DLINUX_TCP_HEADER"
 AC_MSG_RESULT(found)
@@ -102,13 +99,10 @@ AC_TRY_COMPILE([
 #include <stdio.h>
 #include <netinet/tcp.h>
 ], [
-int main()
-{
 	struct tcphdr *tcp;
 	tcp->th_sport= 1;
 
 	return 0;
-}
 ], [
 AC_MSG_RESULT(found)
 tcphdr=yes