Add compat code for missing wcwidth.

If we don't have wcwidth force fallback implementations of nl_langinfo
and mbtowc.  Based on advice from Ingo Schwarze.

1 files changed, 6 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index 005a9ead5..f6c44b874 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1721,7 +1721,6 @@ AC_CHECK_FUNCS([ \
         inet_ntop \
         innetgr \
         login_getcapbool \
-        mblen \
         md5_crypt \
         memmove \
         memset_s \
@@ -1789,6 +1788,12 @@ AC_CHECK_FUNCS([ \
         warn \
 ])
 
+dnl Wide character support.  Linux man page says it needs _XOPEN_SOURCE.
+saved_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -D_XOPEN_SOURCE"
+AC_CHECK_FUNCS([mblen mbtowc nl_langinfo wcwidth])
+CFLAGS="$saved_CFLAGS"
+
 AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[ #include <ctype.h> ]],