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-rw-r--r--ctype/ctype.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/ctype/ctype.h b/ctype/ctype.h
index 9469907b27..64f5e4b7a0 100644
--- a/ctype/ctype.h
+++ b/ctype/ctype.h
@@ -104,6 +104,11 @@ __exctype (isblank);
 __END_NAMESPACE_C99
 #endif
 
+#ifdef __USE_GNU
+/* Test C for a set of character classes according to MASK.  */
+extern int isctype (int __c, int __mask) __THROW;
+#endif
+
 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 
 /* Return nonzero iff C is in the ASCII set