add jtk.c

Rsconscript

@@ -4,6 +4,7 @@ end
 
 build do
   main_env = Rscons::Environment.new do |env|
+    env["LIBS"] += %w[X11 GLX]
     env["sources"] = glob("src/**/*.{c,d}")
     env["D_IMPORT_PATH"] += glob("src/**")
     env.Program("jes", "${sources}")