--- pjproject-2.6/pjlib/src/pj/os_core_unix.c	2016-04-13 08:24:48.000000000 +0200
+++ pjproject-new/pjlib/src/pj/os_core_unix.c	2017-05-08 09:51:49.980905420 +0200
@@ -1123,7 +1123,7 @@ static pj_status_t init_mutex(pj_mutex_t
 	return PJ_RETURN_OS_ERROR(rc);
 
     if (type == PJ_MUTEX_SIMPLE) {
-#if (defined(PJ_LINUX) && PJ_LINUX!=0) || \
+#if (defined(PJ_LINUX) && PJ_LINUX!=0 && defined(__GLIBC__)) || \
     defined(PJ_HAS_PTHREAD_MUTEXATTR_SETTYPE)
 	rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
 #elif (defined(PJ_RTEMS) && PJ_RTEMS!=0) || \
@@ -1133,7 +1133,7 @@ static pj_status_t init_mutex(pj_mutex_t
 	rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
 #endif
     } else {
-#if (defined(PJ_LINUX) && PJ_LINUX!=0) || \
+#if (defined(PJ_LINUX) && PJ_LINUX!=0 && defined(__GLIBC__)) || \
      defined(PJ_HAS_PTHREAD_MUTEXATTR_SETTYPE)
 	rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
 #elif (defined(PJ_RTEMS) && PJ_RTEMS!=0) || \