+
+dnl From codeset.m4 (in libcharset):
+#serial 2
+
+dnl From Bruno Haible.
+
+AC_DEFUN(jm_LANGINFO_CODESET,
+[
+ AC_CHECK_HEADERS(langinfo.h)
+ AC_CHECK_FUNCS(nl_langinfo)
+
+ AC_CACHE_CHECK([for nl_langinfo and CODESET], jm_cv_langinfo_codeset,
+ [AC_TRY_LINK([#include <langinfo.h>],
+ [char* cs = nl_langinfo(CODESET);],
+ jm_cv_langinfo_codeset=yes,
+ jm_cv_langinfo_codeset=no)
+ ])
+ if test $jm_cv_langinfo_codeset = yes; then
+ AC_DEFINE(HAVE_LANGINFO_CODESET, 1,
+ [Define if you have <langinfo.h> and nl_langinfo(CODESET).])
+ fi
+])
+
+dnl From glibc21.m4 (in libcharset):
+#serial 2
+
+# Test for the GNU C Library, version 2.1 or newer.
+# From Bruno Haible.
+
+AC_DEFUN(jm_GLIBC21,
+ [
+ AC_CACHE_CHECK(whether we are using the GNU C Library 2.1 or newer,
+ ac_cv_gnu_library_2_1,
+ [AC_EGREP_CPP([Lucky GNU user],
+ [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2)
+ Lucky GNU user
+ #endif
+#endif
+ ],
+ ac_cv_gnu_library_2_1=yes,
+ ac_cv_gnu_library_2_1=no)
+ ]
+ )
+ AC_SUBST(GLIBC21)
+ GLIBC21="$ac_cv_gnu_library_2_1"
+ ]
+)
+