On Linux, wcwidth() needs _XOPEN_SOURCE, or just _GNU_SOURCE for simplicity.

Besides, signedness of wchar_t and wint_t may differ, it i only
guaranteed that each wchar_t can be represented as a wint_t.
A problem report by Daniel Levai reminded me to fix this.

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index baa05ad4..0fb841cf 100755
--- a/configure
+++ b/configure
@@ -253,7 +253,7 @@ cat << __HEREDOC__
 #define MANDOC_CONFIG_H
 
 #if defined(__linux__) || defined(__MINT__)
-#define _GNU_SOURCE /* getsubopt(), strcasestr(), strptime() */
+#define _GNU_SOURCE	/* See test-*.c what needs this. */
 #endif
 
 __HEREDOC__