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-rw-r--r--gdk/gdki18n.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/gdk/gdki18n.h b/gdk/gdki18n.h
index 62213ebe6..7e277648b 100644
--- a/gdk/gdki18n.h
+++ b/gdk/gdki18n.h
@@ -47,6 +47,7 @@
# define gdk_iswalnum(c) iswalnum(c)
# define gdk_iswspace(c) iswspace(c)
#else
+# include <ctype.h>
# define gdk_iswalnum(c) ((wchar_t)(c) <= 0xFF && isalnum(c))
# define gdk_iswspace(c) ((wchar_t)(c) <= 0xFF && isspace(c))
#endif