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-rw-r--r--src/math/lgammal.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/lgammal.c b/src/math/lgammal.c
index 603477c9..a33707ad 100644
--- a/src/math/lgammal.c
+++ b/src/math/lgammal.c
@@ -85,6 +85,7 @@
  *
  */
 
+#define _GNU_SOURCE
 #include "libm.h"
 
 long double lgammal(long double x)