diff --git a/SConstruct b/SConstruct
index 6712962..99c2977 100644
--- a/SConstruct
+++ b/SConstruct
@@ -63,17 +63,13 @@ def F2C(target, source, env):
     f.close()
     return None
 
-def SDLKeymap(target, source, env):
-    Popen(['perl', str(source[0])]).wait()
-
 def bt(cmd):
     return Popen(cmd, shell = True, stdout = PIPE).communicate()[0]
 
-env.Append(BUILDERS = {'SDLKeymap' : Builder(action = SDLKeymap)})
 env.Append(BUILDERS = {'F2C' : Builder(action = F2C)})
 
 env.F2C('ag_lua.cc', 'src/ag.lua')
-env.SDLKeymap('sdl_keymap.cc', 'gen-sdl-keymap.pl')
+env.Command('sdl_keymap.cc', 'gen-sdl-keymap.pl', 'perl gen-sdl-keymap.pl')
 env.Program(target, sources)
 
 env.Install('dist', target)