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-rw-r--r--include/ctype.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/ctype.h b/include/ctype.h
index a85e907e..8ceaa9f9 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -30,7 +30,8 @@ int   toupper(int);
 
 
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
+ || defined(_BSD_SOURCE)
 
 #define __NEED_locale_t
 #include <bits/alltypes.h>