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-rw-r--r--include/math.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/math.h b/include/math.h
index 83a154d21..82eb0f314 100644
--- a/include/math.h
+++ b/include/math.h
@@ -175,6 +175,7 @@ extern long double __REDIRECT_NTH (nexttowardl,
#if defined __USE_MISC || defined __USE_XOPEN
/* This variable is used by `gamma' and `lgamma'. */
extern int signgam;
+libm_hidden_proto(signgam)
#endif