Begin removing SDL

Window and OpenGL context creation working.
Keyboard, mouse, window events not yet working.

wscript

@@ -11,8 +11,11 @@ def options(opt):
 def configure(conf):
     conf.load("compiler_c compiler_cxx")
     conf.check(header_name = "getopt.h", global_define = False)
-    conf.check_cfg(package = "sdl2", args = "--cflags --libs")
     conf.check_cfg(package = "freetype2", uselib_store = "FreeType2", args = "--cflags --libs")
+    if platform.system() == "Linux":
+        conf.check(header_name = "X11/Xlib.h", global_define = False)
+    elif platform.system() == "Windows":
+        conf.check(header_name = "windows.h", global_define = False)
 
 def build(bld):
     defines = ['APPNAME="%s"' % APPNAME]
@@ -22,9 +25,11 @@ def build(bld):
     libs = []
     if platform.system() == "Linux":
         defines += ["PLATFORM_LINUX"]
-        libs += ["dl", "GL"]
-    elif re.search(r'MINGW', platform.system()):
+        defines += ["GUI_X"]
+        libs += ["dl", "GL", "X11"]
+    elif platform.system() == "Windows":
         defines += ["PLATFORM_WINDOWS"]
+        defines += ["GUI_WINDOWS"]
         libs += ["opengl32"]
     defines += ['GLCXX_GL_INCLUDE="gl3w.h"']
     sources = bld.path.ant_glob(["src/**/*.cc", "src/**/*.c", "libs/glcxx/src/glcxx/*"])
@@ -35,7 +40,7 @@ def build(bld):
         defines = defines,
         cxxflags = ["-Wall", "-std=gnu++14", "-O2", "-Wno-switch"],
         lib = libs,
-        uselib = ["SDL2", "FreeType2"])
+        uselib = ["FreeType2"])
 
     test_libs = libs + []
     if platform.system() == "Linux":
@@ -56,4 +61,4 @@ def build(bld):
         lib = test_libs,
         cxxflags = ["-Wall", "-std=gnu++14", "--coverage", "-Wno-switch", "-include", "iostream"],
         linkflags = ["--coverage"],
-        uselib = ["SDL2", "FreeType2"])
+        uselib = ["FreeType2"])