mkdir 'dir1'
cat > 'dir1/Makefile.omk' <<'EOF'
SUBDIRS=dir3

USE_LEAF_MAKEFILES=n
EOF
mkdir 'dir1/dir3'
echo '$(warning Makefile.omk used without leaf Makefile)' > 'dir1/dir3/Makefile.omk'
cat > 'config.omk-default' <<'EOF'
# Start of OMK config file
# This file should not be altered manually
# Overrides should be stored in file config.omk

# Config for 
EOF
echo 'SUBDIRS=dir1 dir2' > 'Makefile.omk'
mkdir 'dir2'
echo 'SUBDIRS=dir4' > 'dir2/Makefile.omk'
mkdir 'dir2/dir4'
cat > 'dir2/dir4/Makefile' <<'EOF'
$(warning Leaf Makefile included)

%:
	@echo Executed $@
EOF