# diff
$ diff -ud Makefile.org Makefile
# create
$ diff -ud Makefile.org Makefile > Makefile.patch.3.0.0
# apply
$ patch -u Makefile.new < Makefile.patch.3.0.0
$ make PLATFORM=PLATFORM_DESKTOP RAYLIB_LIBTYPE=SHARED RAYLIB_MODULE_PHYSAC=TRUE RAYLIB_MODULE_RAYGUI=TRUE RAYLIB_MODULE_RAYGUI_PATH=../../raygui/src VPATH=../../raygui/src
$ make PLATFORM=PLATFORM_DESKTOP RAYLIB_LIBTYPE=SHARED RAYLIB_MODULE_PHYSAC=TRUE RAYLIB_MODULE_RAYGUI=TRUE RAYLIB_MODULE_RAYGUI_PATH=../../raygui/src VPATH=../../raygui/src RAYLIB_SRC_PATH=.
$ sudo make install DESTDIR=$HOME/local/raylib-3.0.0 RAYLIB_LIBTYPE=SHARED
$ sudo make install DESTDIR=$HOME/local/raylib-3.1.0 RAYLIB_LIBTYPE=SHARED RAYLIB_SRC_PATH=.