diff --git a/include/asterisk.h b/include/asterisk.h
index 3a6cdc0f97..9f9c7e8664 100644
--- a/include/asterisk.h
+++ b/include/asterisk.h
@@ -28,9 +28,12 @@
 #if _POSIX_VERSION < 200112L
 #error System does not support POSIX version 200112.
 #endif
+
+/* It is not clear if we need this version check at this time.
 #if _XOPEN_VERSION < 600
 #error System does not support XOPEN version 600.
 #endif
+*/
 
 #if !defined(NO_MALLOC_DEBUG) && !defined(STANDALONE) && defined(MALLOC_DEBUG)
 #include "asterisk/astmm.h"