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-rw-r--r--lib/regex_internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/regex_internal.h b/lib/regex_internal.h
index b2c44fe18..993c9923e 100644
--- a/lib/regex_internal.h
+++ b/lib/regex_internal.h
@@ -56,7 +56,7 @@
#endif
/* In case that the system doesn't have isblank(). */
-#if !defined _LIBC && !defined HAVE_ISBLANK && !defined isblank
+#if !defined _LIBC && !HAVE_DECL_ISBLANK && !defined isblank
# define isblank(ch) ((ch) == ' ' || (ch) == '\t')
#endif