Oops, add glib21.m4 to the m4 dir

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1040 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

Makefile.am

@@ -4,7 +4,7 @@ M4DIR = $(srcdir)/m4
 ACLOCAL_AMFLAGS = -I $(M4DIR)
 ACINCLUDE_INPUTS = $(M4DIR)/gettext.m4 $(M4DIR)/largefile.m4 \
 	$(M4DIR)/progtest.m4 $(M4DIR)/lcmessage.m4 $(M4DIR)/iconv.m4 \
-	$(M4DIR)/codeset.m4
+	$(M4DIR)/codeset.m4 $(M4DIR)/glibc21.m4
 
 bin_PROGRAMS = 	nano
 nano_SOURCES =	color.c \

m4/gettext.m4

@@ -307,7 +307,7 @@ AC_DEFUN([NANO_AM_GNU_GETTEXT],
    AC_REQUIRE([AC_TYPE_SIZE_T])dnl
    AC_REQUIRE([AC_FUNC_ALLOCA])dnl
    AC_REQUIRE([AC_FUNC_MMAP])dnl
-   AC_REQUIRE([jm_GLIBC21])dnl
+   AC_REQUIRE([nano_jm_GLIBC21])dnl
 
    AC_CHECK_HEADERS([argz.h limits.h locale.h nl_types.h malloc.h stddef.h \
 stdlib.h string.h unistd.h sys/param.h])

m4/glibc21.m4

+#serial 2
+
+# Test for the GNU C Library, version 2.1 or newer.
+# From Bruno Haible.
+
+AC_DEFUN([nano_jm_GLIBC21],
+  [
+    AC_CACHE_CHECK(whether we are using the GNU C Library 2.1 or newer,
+      ac_cv_gnu_library_2_1,
+      [AC_EGREP_CPP([Lucky GNU user],
+	[
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2)
+  Lucky GNU user
+ #endif
+#endif
+	],
+	ac_cv_gnu_library_2_1=yes,
+	ac_cv_gnu_library_2_1=no)
+      ]
+    )
+    AC_SUBST(GLIBC21)
+    GLIBC21="$ac_cv_gnu_library_2_1"
+  ]
+)