Patch #730597: Disable POPEN for RTEMS.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index f5b15d9..fa8215a 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -122,7 +122,9 @@
 #define HAVE_KILL       1
 #define HAVE_OPENDIR    1
 #define HAVE_PIPE       1
+#ifndef __rtems__
 #define HAVE_POPEN      1
+#endif
 #define HAVE_SYSTEM	1
 #define HAVE_WAIT       1
 #define HAVE_TTYNAME	1