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-rw-r--r--include/ruby/missing.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/ruby/missing.h b/include/ruby/missing.h
index e4ac07018fb..18dabaa5b3e 100644
--- a/include/ruby/missing.h
+++ b/include/ruby/missing.h
@@ -159,6 +159,10 @@ RUBY_EXTERN size_t strlcpy(char *, const char*, size_t);
RUBY_EXTERN size_t strlcat(char *, const char*, size_t);
#endif
+#ifndef HAVE_FFS
+RUBY_EXTERN int ffs(int);
+#endif
+
#if defined(__cplusplus)
#if 0
{ /* satisfy cc-mode */