From 5e40d2be2ed34a0e17779248f751c6037da7d727 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Thu, 13 Aug 2026 14:54:46 +0000
Subject: [PATCH] Stop m4 from mangling C source in libpcap check

---
 acinclude.m4    | 8 ++++----
 configure       | 4 ++--
 ncat/configure  | 4 ++--
 nping/configure | 4 ++--
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index e185898b5..5db437615 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -34,10 +34,10 @@ AC_DEFUN([PCAP_IS_SUITABLE],
 [
   AC_CHECK_HEADERS(sys/ioccom.h sys/time.h net/bpf.h)
   AC_MSG_CHECKING(if libpcap is suitable)
-  AC_RUN_IFELSE([AC_LANG_PROGRAM([
+  AC_RUN_IFELSE([AC_LANG_PROGRAM([[
 #include <stdio.h>
 extern char pcap_version[];
-], [
+]], [
   int major, minor1, minor2;
   sscanf(pcap_version,"%d.%d.%d", &major, &minor1, &minor2);
   if (major > 0)
@@ -47,7 +47,7 @@ extern char pcap_version[];
   if (minor2 < 4)
     return 1;
   ])], [
-    AC_RUN_IFELSE([AC_LANG_PROGRAM([
+    AC_RUN_IFELSE([AC_LANG_PROGRAM([[
 #include <stdio.h>
 #include <sys/types.h>
 #ifdef HAVE_SYS_IOCCOM_H
@@ -60,7 +60,7 @@ extern char pcap_version[];
 #include <net/bpf.h>
 #endif
 extern char pcap_version[];
-], [
+]], [
   int major, minor;
   sscanf(pcap_version,"%d.%d", &major, &minor);
   if ((major == 1 && minor >= 1) || major > 1)
diff --git a/configure b/configure
index 2c9005462..190fb6c5e 100755
--- a/configure
+++ b/configure
@@ -7448,7 +7448,7 @@ else $as_nop
 /* end confdefs.h.  */
 
 #include <stdio.h>
-extern char pcap_version;
+extern char pcap_version[];
 
 int
 main (void)
@@ -7491,7 +7491,7 @@ else $as_nop
 #ifdef HAVE_NET_BPF_H
 #include <net/bpf.h>
 #endif
-extern char pcap_version;
+extern char pcap_version[];
 
 int
 main (void)
diff --git a/ncat/configure b/ncat/configure
index c398c62f3..c06a16d5e 100755
--- a/ncat/configure
+++ b/ncat/configure
@@ -5758,7 +5758,7 @@ else $as_nop
 /* end confdefs.h.  */
 
 #include <stdio.h>
-extern char pcap_version;
+extern char pcap_version[];
 
 int
 main (void)
@@ -5801,7 +5801,7 @@ else $as_nop
 #ifdef HAVE_NET_BPF_H
 #include <net/bpf.h>
 #endif
-extern char pcap_version;
+extern char pcap_version[];
 
 int
 main (void)
diff --git a/nping/configure b/nping/configure
index f61c93a09..8f6f2aa84 100755
--- a/nping/configure
+++ b/nping/configure
@@ -6251,7 +6251,7 @@ else $as_nop
 /* end confdefs.h.  */
 
 #include <stdio.h>
-extern char pcap_version;
+extern char pcap_version[];
 
 int
 main (void)
@@ -6294,7 +6294,7 @@ else $as_nop
 #ifdef HAVE_NET_BPF_H
 #include <net/bpf.h>
 #endif
-extern char pcap_version;
+extern char pcap_version[];
 
 int
 main (void)