diff --git a/umdiff/.gitignore b/umdiff/.gitignore
index e3f5778..51c0fce 100644
--- a/umdiff/.gitignore
+++ b/umdiff/.gitignore
@@ -1,2 +1,3 @@
 umdiff
 *.rl
+librsync.build
diff --git a/umdiff/Makefile b/umdiff/Makefile
index 82103c6..f9ff907 100644
--- a/umdiff/Makefile
+++ b/umdiff/Makefile
@@ -1,5 +1,5 @@
 TARGET = umdiff
-C_OBJS = main.o rdiff.o
+C_OBJS = main.c.o rdiff.c.o file.c.o patch.c.o
 OBJS   = $(C_OBJS)
 
 CMAKE := cmake
@@ -24,6 +24,9 @@ usage.rl: USAGE
 %.rl.h: %.rl
 	$(RAGEL) $< -o $@
 
+%.c.o: %.c
+	$(CC) -c $< -o $@ $(CFLAGS)
+
 librsync:
 	git clone https://github.com/librsync/librsync