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-rw-r--r--src/math/lgamma.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/lgamma.c b/src/math/lgamma.c
index d12462b9..9af7eee4 100644
--- a/src/math/lgamma.c
+++ b/src/math/lgamma.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
#include "libm.h"
double lgamma(double x)