diff --git a/lwip-HEAD/src/SConscript b/lwip-HEAD/src/SConscript
--- a/lwip-HEAD/src/SConscript
+++ b/lwip-HEAD/src/SConscript
@@ -75,5 +75,5 @@
 env.Append(LINKFLAGS = link_flags)
 
 so = env.SharedLibrary('lwip', sources)
-install = env.Install(dir = "$PREFIX/lib", source = output)
+install = env.Install(dir = "$PREFIX/lib", source = so)
 env.Alias('install', install)