libyang BUGFIX set feature macro for strdup() on OSX
Since OS X requires different value (600) of _XOPEN_SOURCE feature test macro for
strdup() than linux (500), better use _POSIX_C_SOURCE 200809L. It is available
since glibc 2.12 (released 2010) so it shouldn't be an issue.
diff --git a/src/xpath.c b/src/xpath.c
index 88403a0..c8beb28 100644
--- a/src/xpath.c
+++ b/src/xpath.c
@@ -12,6 +12,7 @@
* https://opensource.org/licenses/BSD-3-Clause
*/
#define _GNU_SOURCE
+#define _POSIX_C_SOURCE 200809L /* strdup, strndup */
/* needed by libmath functions isfinite(), isinf(), isnan(), signbit(), ... */
#define _ISOC99_SOURCE