From Sam Rushing's Medusa, via SF patch #100858: add & document
os.seteuid(), os.setegid(), os.setreuid(), os.setregid().
diff --git a/config.h.in b/config.h.in
index 53c263d..02e3bd8 100644
--- a/config.h.in
+++ b/config.h.in
@@ -407,6 +407,12 @@
 /* Define if you have the select function.  */
 #undef HAVE_SELECT
 
+/* Define if you have the setegid function.  */
+#undef HAVE_SETEGID
+
+/* Define if you have the seteuid function.  */
+#undef HAVE_SETEUID
+
 /* Define if you have the setgid function.  */
 #undef HAVE_SETGID
 
@@ -419,6 +425,12 @@
 /* Define if you have the setpgrp function.  */
 #undef HAVE_SETPGRP
 
+/* Define if you have the setregid function.  */
+#undef HAVE_SETREGID
+
+/* Define if you have the setreuid function.  */
+#undef HAVE_SETREUID
+
 /* Define if you have the setsid function.  */
 #undef HAVE_SETSID