1 files changed, 6 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index f916930..36bd738 100644
--- a/Makefile
+++ b/Makefile
@@ -12,15 +12,17 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-ugtd: ugtd.urp mdl main.urs main.ur
+MDL = mdl/lib.urp mdl/mdl.ur
+
+ugtd: ugtd.urp $(MDL) main.urs main.ur
 	urweb -ccompiler build_scripts/clang -output $@ ugtd
 
 .PHONY: mdl
-mdl: mdl/lib.urp mdl/mdl.ur
-mdl/lib.urp mdl/mdl.ur: mdl/classes
+mdl: $(MDL)
+$(MDL): mdl/classes
 	build_scripts/generate_mdl <$<
 
 .PHONY: clean
 clean:
-	$(RM) mdl/lib.urp mdl/mdl.ur
+	$(RM) $(MDL)
 	$(RM) ugtd