in math.h make lgamma_r and non-double bessel _GNU_SOURCE only

[musl] / src / math / lgammal.c

diff --git a/src/math/lgammal.c b/src/math/lgammal.c
index 603477c..a33707a 100644 (file)
--- 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)