include cleanups: remove unused headers and add feature test macros

[musl] / src / stdlib / ecvt.c

diff --git a/src/stdlib/ecvt.c b/src/stdlib/ecvt.c
index 79c3de6..797b664 100644 (file)
--- a/src/stdlib/ecvt.c
+++ b/src/stdlib/ecvt.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <stdio.h>