Fix autoconf warning, warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
Call AC_USE_SYSTEM_EXTENSIONS before LT_INIT
diff --git a/configure.ac b/configure.ac
index 331bd32..4bc2133 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,30 +37,6 @@
AM_INIT_AUTOMAKE([1.11 parallel-tests dist-bzip2])
m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
-dnl Initialize libtool
-LT_PREREQ([2.2])
-LT_INIT([disable-static win32-dll])
-
-dnl libtool versioning
-
-dnl bump revision when fixing bugs
-dnl bump current and age, reset revision to zero when adding APIs
-dnl bump current, leave age, reset revision to zero when changing/removing APIS
-LIBT_CURRENT=9
-LIBT_REVISION=0
-AC_SUBST(LIBT_CURRENT)
-AC_SUBST(LIBT_REVISION)
-LIBT_AGE=8
-
-LIBT_VERSION_INFO="$LIBT_CURRENT:$LIBT_REVISION:$LIBT_AGE"
-AC_SUBST(LIBT_VERSION_INFO)
-
-LIBT_CURRENT_MINUS_AGE=`expr $LIBT_CURRENT - $LIBT_AGE`
-AC_SUBST(LIBT_CURRENT_MINUS_AGE)
-
-PKGCONFIG_REQUIRES=
-PKGCONFIG_REQUIRES_PRIVATELY=
-
dnl ==========================================================================
AC_CONFIG_HEADERS(config.h)
@@ -87,6 +63,30 @@
AC_MSG_RESULT($_predefined_rm)
fi
+dnl Initialize libtool
+LT_PREREQ([2.2])
+LT_INIT([disable-static win32-dll])
+
+dnl libtool versioning
+
+dnl bump revision when fixing bugs
+dnl bump current and age, reset revision to zero when adding APIs
+dnl bump current, leave age, reset revision to zero when changing/removing APIS
+LIBT_CURRENT=9
+LIBT_REVISION=0
+AC_SUBST(LIBT_CURRENT)
+AC_SUBST(LIBT_REVISION)
+LIBT_AGE=8
+
+LIBT_VERSION_INFO="$LIBT_CURRENT:$LIBT_REVISION:$LIBT_AGE"
+AC_SUBST(LIBT_VERSION_INFO)
+
+LIBT_CURRENT_MINUS_AGE=`expr $LIBT_CURRENT - $LIBT_AGE`
+AC_SUBST(LIBT_CURRENT_MINUS_AGE)
+
+PKGCONFIG_REQUIRES=
+PKGCONFIG_REQUIRES_PRIVATELY=
+
dnl ==========================================================================
case "$host" in
