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-rw-r--r--include/libbb.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/libbb.h b/include/libbb.h
index db43984b8..6d6213901 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -551,4 +551,19 @@ extern uint32_t *bb_crc32_filltable (int endian);
extern const char BB_BANNER[];
+// Make sure we call functions instead of macros.
+#undef isalnum
+#undef isalpha
+#undef isascii
+#undef isblank
+#undef iscntrl
+#undef isdigit
+#undef isgraph
+#undef islower
+#undef isprint
+#undef ispunct
+#undef isspace
+#undef isupper
+#undef isxdigit
+
#endif /* __LIBBUSYBOX_H__ */