diff --git a/Mac/scripts/mkestrres-macerrors.h b/Mac/scripts/mkestrres-macerrors.h
new file mode 100755
index 0000000..26c583d
--- /dev/null
+++ b/Mac/scripts/mkestrres-macerrors.h
@@ -0,0 +1,13 @@
+ /* Errors from InternetConfig.h */
+  icPrefNotFoundErr             = -666, /* Internet preference not found */
+  icPermErr                     = -667, /* cannot set preference  */
+  icPrefDataErr                 = -668, /* problem with preference data  */
+  icInternalErr                 = -669, /* Internet Config internal error  */
+  icTruncatedErr                = -670, /* more data was present than was returned  */
+  icNoMoreWritersErr            = -671, /* you cannot begin a write session because someone else is already doing it  */
+  icNothingToOverrideErr        = -672, /* no component for the override component to capture  */
+  icNoURLErr                    = -673, /* no URL found  */
+  icConfigNotFoundErr           = -674, /* no internet configuration was found  */
+  icConfigInappropriateErr      = -675, /* incorrect manufacturer code  */
+  icProfileNotFoundErr          = -676, /* profile not found  */
+  icTooManyProfilesErr          = -677  /* too many profiles in database  */
diff --git a/Mac/scripts/mkestrres.py b/Mac/scripts/mkestrres.py
index c5ff6d3..bf56e43 100644
--- a/Mac/scripts/mkestrres.py
+++ b/Mac/scripts/mkestrres.py
@@ -123,6 +123,12 @@
 	parse_errors_h(fp, dict)
 	fp.close()
 	
+	fss, ok = macfs.PromptGetFile("Where is mkestrres-MacErrors.h?")
+	if not ok: return
+	fp = open(fss.as_pathname())
+	parse_errors_h(fp, dict)
+	fp.close()
+	
 	if not dict:
 		return