Added libgit2 dependency

makefile

@@ -1,8 +1,8 @@
 CXX := clang++
 CC := clang
 
-INCLUDES := include src thirdparty/luajit/src thirdparty/uniproc/include
-LIBRARY_DIRECTORIES := thirdparty/luajit/src
+INCLUDES := include src thirdparty/luajit/src thirdparty/uniproc/include thirdparty/libgit2/include
+LIBRARY_DIRECTORIES := thirdparty/luajit/src thirdparty/libgit2
 LINKER_INPUTS := lua51 luajit
 
 DEBUG_DEFINES :=
@@ -63,4 +63,10 @@ build_deps: .make/thirdparty_luajit .make/thirdparty_uniproc
 
 .make/thirdparty_uniproc:
 	git submodule update --init --recursive --remote
-	
+	$(call touch,".make/thirdparty_uniproc")
+
+.make/thirdparty_libgit2:
+	git submodule update --init --recursive --remote
+	cd thirdparty/libgit2 && mkdir build
+	cd thirdparty/libgit2/build && cmake .. && cmake --build .
+	$(call touch,".make/thirdparty_libgit2")