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https://bugs.gentoo.org/944019
https://bugs.gentoo.org/921573
Fix implicit defines in configure by defaulting to GNU_SOURCES, set include
ordering straight for implicit define in code and fix sizes/declarations
for C23
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,7 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_INIT([viewglob], [2.0.4])
 AM_INIT_AUTOMAKE
+AC_USE_SYSTEM_EXTENSIONS
 AM_CONFIG_HEADER([config.h])
 RELEASE_DATE="April 26, 2006"
 
--- a/common/conf-to-args.c
+++ b/common/conf-to-args.c
@@ -32,7 +32,7 @@
 	GString* arg_str = NULL;
 
 	gchar buf[1024];
-	gint nread;
+	gssize nread;
 
 	gchar* home = getenv("HOME");
 	if (!home) {
--- a/vgd/tcp-listen.c
+++ b/vgd/tcp-listen.c
@@ -26,6 +26,8 @@
 	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+#include "common.h"
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -34,7 +36,6 @@
 
 #include <string.h>
 
-#include "common.h"
 #include "tcp-listen.h"
 
 
--- a/vgseer/ptytty.c
+++ b/vgseer/ptytty.c
@@ -112,7 +112,7 @@
 #if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
 # if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
     {
-	extern char    *ptsname();
+	extern char    *ptsname(int fd);
 
 #  ifdef PTYS_ARE_GETPT
 	pfd = getpt();