echo 'for-check-1:' >>../src/for-test.sd.mk
make -j4 for-check-1
grep '^for-check-1:' src/Subdir.mk || false
: ----- for-check-2 -----
echo 'for-check-1:' >>../src/for-test.sd.mk
make -j4 for-check-1
grep '^for-check-1:' src/Subdir.mk || false
: ----- for-check-2 -----