[vte] build: Use AC_USE_SYSTEM_EXTENSIONS

[Christian Persch <chpe src gnome org>]

commit e414ab351319a36ff1e55181f901eee8c2030907
Author: Christian Persch <chpe gnome org>
Date:   Wed Apr 23 19:21:06 2014 +0200

    build: Use AC_USE_SYSTEM_EXTENSIONS
    
    ... instead of some grep magic.

 gnome-pty-helper/configure.in |   25 ++-----------------------
 1 files changed, 2 insertions(+), 23 deletions(-)
---
diff --git a/gnome-pty-helper/configure.in b/gnome-pty-helper/configure.in
index 16940ea..355a858 100644
--- a/gnome-pty-helper/configure.in
+++ b/gnome-pty-helper/configure.in
@@ -5,14 +5,13 @@ AM_INIT_AUTOMAKE([1.9 foreign no-dist-gzip dist-bzip2])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR([gnome-pty.h])
 
+AC_PROG_CC
+AC_USE_SYSTEM_EXTENSIONS
 AC_ISC_POSIX
 AC_PROG_CC
 AC_STDC_HEADERS
 AM_PROG_CC_STDC
 
-if test -z "$enable_maintainer_mode"; then
-  enable_maintainer_mode=yes
-fi
 AM_MAINTAINER_MODE([enable])
 
 AC_CHECK_HEADERS(sys/syslimits.h sys/time.h sys/types.h sys/un.h alloca.h lastlog.h libutil.h paths.h pty.h 
stropts.h termios.h ttyent.h util.h utmp.h utmpx.h pty.h util.h libutil.h ttyent.h)
@@ -25,26 +24,6 @@ GPH_CHECK_UTMP
 
 AC_CHECK_HEADERS(stropts.h)
 
-# Use all available features under glibc, and disable accidental use of
-# deprecated functionality.
-AC_EGREP_CPP(glibc,
-               [
-                #include <stdio.h>
-                #ifdef __GLIBC__
-                glibc
-                #endif
-               ],
-               AC_DEFINE(_GNU_SOURCE,1,[Use all glibc features.]))
-
-AC_CANONICAL_HOST
-case $host in
-*-*-solaris*)
-       AC_DEFINE(_XOPEN_SOURCE_EXTENDED,1,[Needed to get declarations for msg_control and msg_controllen on 
Solaris])
-       AC_DEFINE(_XOPEN_SOURCE,1,[Needed to get declarations for msg_control and msg_controllen on Solaris])
-       AC_DEFINE(__EXTENSIONS__,1,[Needed to get declarations for msg_control and msg_controllen on Solaris])
-       ;;
-esac
-
 AC_ARG_VAR([SUID_CFLAGS],
           [CFLAGS used for binaries which are usually with the suid bit])
 AC_ARG_VAR([SUID_LDFLAGS],