Fix mkdir error when directory exist

diff --git a/makefile b/makefile
index 71982b9..f1f33d7 100644 (file)
--- a/makefile
+++ b/makefile
@@ -7,8 +7,8 @@ LIB=lib
 ALL: directory lib main
 
 directory:
-       mkdir $(BIN)
-       mkdir $(LIB)
+       mkdir -p $(BIN)
+       mkdir -p $(LIB)
 
 lib: object
        gcc -shared $(BIN)/lib_swift.o -o $(LIB)/libswift.so