run_make_test(undef, 'FOO=C', "C f1\n");
+# TEST #19: Conditional variables with command-line settings
+
+run_make_test('
+a: FOO ?= f1
+a: ; @echo "$(FOO)"
+',
+ '', "f1\n");
+
+run_make_test(undef, 'FOO=C', "C\n");
+
# TEST #20: Check for continuation after semicolons
run_make_test(q!
-a: A = 'hello; \
+a: A = 'hello;\
world'
a: ; @echo $(A)
!,