Add linux compilation

Can now compile in linux. Still need to put a symbolic link to luajit
libs and a LD_LIBRARY_PATH to the current executable directory so it can
find libraylib.so (as in `LD_LIBRARY_PATH=$PWD ./ca`).

CMakeLists.txt

@@ -96,13 +96,23 @@ IF (WIN32)
     third_party/clip/clip_win_wic.cpp
     third_party/clip/clip_win_bmp.cpp
   )
+ELSEIF (UNIX)
+  ADD_COMPILE_DEFINITIONS(-DHAVE_XCB_XLIB_H=1)
+  SET(clip_libs xcb pthread)
+  SET(ca_src ${ca_src}
+    third_party/clip/clip_x11.cpp
+  )
 ELSEIF (APPLE)
   SET(ca_src ${ca_src}
     third_party/clip/clip_osx.mm
   )
 ENDIF()
 
 add_executable(ca ${ca_src})
+IF (UNIX)
+  # Need this command so luajit can access the C API from ffi
+  SET_PROPERTY(TARGET ca PROPERTY ENABLE_EXPORTS ON)
+ENDIF()
 
 target_include_directories(ca PRIVATE
   src
@@ -123,4 +133,4 @@ ENDIF()
 IF (OPENMP)
   SET(openmp_lib OpenMP::OpenMP_C)
 ENDIF ()
-target_link_libraries(ca raylib ${shlwapi_lib} nfd ${openmp_lib} ${luajit_lib})
+target_link_libraries(ca raylib ${shlwapi_lib} nfd ${openmp_lib} ${luajit_lib} ${clip_libs})

README.md

@@ -25,10 +25,14 @@ Made with [raylib](https://www.raylib.com/).
 
 ## Building
 
-Compiles in Windows.
+Compiles in Windows, Linux and Mac.
 
 - Need to build within the `build/` directory (or something within the root directory so it can access `luasrc/` and `asset/` folder)
-- Need to download and build [luajit](https://luajit.org/download.html) locally in the folder `LuaJIT`, so that `LuaJIT/src/`, `LuaJIT/src/lua51.dll` and `LuaJIT/src/luajit.lib` are there.
+- You need to compile `LuaJIT/`. You can see the instructions [here](https://luajit.org/install.html). The binaries will go to the `LuaJIT/src` folder. In MAC it seems you need to install it too. In linux I've managed to make it work with a symbolic link from `build/`. In Windows it worked directly with the cmake directives ( if it doesnt for you mind that it might be something related to link path).
+- In linux it might complain that it can't find `libraylib.so`, that's because linux won't look for libraries in the directory it is in, you can fix with it `LD_LIBRARY_PATH=$PWD ./ca` until we find a cleaner solution.
+- By default OPENMP is off, you might want to activate in the `OPENMP` cmake option.
+
+The Linux and MAC versions are not stable yet: they compile but have some divergences from windows version.
 
 ## License