diff --git a/autosetup/autosetup-find-tclsh b/autosetup/autosetup-find-tclsh
index dfe70f8a..12914edf 100755
--- a/autosetup/autosetup-find-tclsh
+++ b/autosetup/autosetup-find-tclsh
@@ -10,7 +10,7 @@ for tclsh in $autosetup_tclsh jimsh tclsh tclsh8.5 tclsh8.6; do
 done
 echo 1>&2 "No installed jimsh or tclsh, building local bootstrap jimsh0"
 for cc in ${CC_FOR_BUILD:-cc} gcc; do
-	{ $cc -o "$d/jimsh0" "$d/jimsh0.c"; } 2>/dev/null || continue
+	{ $cc ${CFLAGS} -o "$d/jimsh0" "$d/jimsh0.c"; } 2>/dev/null || continue
 	"$d/jimsh0" "$d/autosetup-test-tclsh" && exit 0
 done
 echo 1>&2 "No working C compiler found. Tried ${CC_FOR_BUILD:-cc} and gcc."
