added install target

Makefile

@@ -1,2 +1,7 @@
+export SCONSFLAGS := -Q
+
 all:
-	@scons -Q
+	@scons
+
+install:
+	@scons $@

SConstruct

@@ -1,5 +1,10 @@
 
+install_dir = '/usr/lib/gnome-screensaver/gnome-screensaver'
+
 env = Environment()
 env.ParseConfig("pkg-config --cflags --libs glib-2.0 gdk-2.0 atk gtk+-2.0")
 
-env.Program('dwss', [Glob('*.c'), Glob('*.cc')])
+dwss = env.Program('dwss', [Glob('*.c'), Glob('*.cc')])
+
+env.Install(install_dir, dwss)
+env.Alias('install', install_dir)