MSL errno.h has moved some errors around, and doesn't document
them in comments, so we do that ourselves.
diff --git a/Mac/scripts/mkestrres.py b/Mac/scripts/mkestrres.py
index 56fec98..f9874f6 100644
--- a/Mac/scripts/mkestrres.py
+++ b/Mac/scripts/mkestrres.py
@@ -90,6 +90,12 @@
 	parse_errno_h(fp, dict)
 	fp.close()
 	
+	fss, ok = macfs.PromptGetFile("Select 2nd errno.h or cancel")
+	if not ok: return
+	fp = open(fss.as_pathname())
+	parse_errno_h(fp, dict)
+	fp.close()
+	
 	fss, ok = macfs.PromptGetFile("Where is Errors.h?")
 	if not ok: return
 	fp = open(fss.as_pathname())