diff --git a/TODO b/TODO
index 85e37474b..773850908 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,20 @@
 TODO for AT&T ksh93, 93u+m bugfix branch
 
+______
+Fix regression test failures:
+
+- On OpenBSD, there are 15 locale-related test failures in variables.sh.
+
+______
+Fix build failures:
+
+- ksh does not currently build on AIX, HP-UX, Solaris, or QNX.
+
+______
+Remove hack for 'test -t' with no args == 'test -t 1':
+- from sh/parse.c, qscan()
+- from bltins/test.c
+
 ______
 Fix or remove broken default aliases:
 
@@ -38,6 +53,7 @@ https://github.com/modernish/modernish/tree/0.16/lib/modernish/cap/
   or
 	set -- command ls; "$@"
   don't work.
+  See also: https://github.com/att/ast/issues/963
 
 - BUG_CMDSPASGN: preceding a "special builtin"[*] with 'command' does not
   stop preceding invocation-local variable assignments from becoming global.
diff --git a/src/cmd/INIT/cc.darwin b/src/cmd/INIT/cc.darwin
index 2af08a00d..21f84c997 100755
--- a/src/cmd/INIT/cc.darwin
+++ b/src/cmd/INIT/cc.darwin
@@ -46,7 +46,7 @@ init)	echo "cc: arguments expected" >&2
 cpp)	$CC -E "$@"
 	;;
 cc)	$CC -DSHOPT_SPAWN=0 -D_ast_int8_t=int64_t -D_lib_memccpy \
-		-Wno-unused-value -Wno-parentheses "$@"
+		-Wno-unused-value -Wno-parentheses -Wno-macro-redefined "$@"
 	;;
 dll)	$CC -Wl,-flat_namespace -dynamiclib -undefined dynamic_lookup "$@"
 	;;