diff --git a/makefile b/makefile
index 1754ece..fcafe1c 100644
--- a/makefile
+++ b/makefile
@@ -8,26 +8,29 @@ DMD_FLAGS := -O -inline $(DMD_COMMON_FLAGS)
 DMD_TEST_FLAGS := -unittest -g $(DMD_COMMON_FLAGS)
 LDC_FLAGS := -g -w -oq $(INCLUDE_PATHS)
 GDC_FLAGS := -g -w -oq $(INCLUDE_PATHS)
+DC ?= dmd
+LDC ?= ldc2
+GDC ?= gdc
 
 .PHONY: dmd ldc gdc test
 
 dmd: bin/dfmt
 
 ldc: $(SRC)
-	ldc2 $(LDC_FLAGS) $^ -ofbin/dfmt
+	$(LDC) $(LDC_FLAGS) $^ -ofbin/dfmt
 	-rm -f *.o
 
 gdc: $(SRC)
-	gdc $(GDC_FLAGS) $^ -obin/dfmt
+	$(GDC) $(GDC_FLAGS) $^ -obin/dfmt
 
 test: bin/dfmt
 	cd tests && ./test.sh
 
 bin/dfmt-test: $(SRC)
-	dmd $(DMD_TEST_FLAGS) $^ -of$@
+	$(DC) $(DMD_TEST_FLAGS) $^ -of$@
 
 bin/dfmt: $(SRC)
-	dmd $(DMD_FLAGS) $^ -of$@
+	$(DC) $(DMD_FLAGS) $^ -of$@
 
 debug: $(SRC)
-	dmd $(DMD_DEBUG_FLAGS) $^ -ofbin/dfmt
+	$(DC) $(DMD_DEBUG_FLAGS) $^ -ofbin/dfmt