--- src/SConscript.client.orig	2012-11-27 05:08:44.000000000 +0100
+++ src/SConscript.client	2012-12-29 10:51:59.493004028 +0100
@@ -134,7 +134,7 @@ env.Install(
 # install
 prefix = GetOption("prefix")
 
-env.Install(prefix + "/lib", '${LIBPREFIX}mongoclient${LIBSUFFIX}')
+env.Install('$INSTALL_DIR/$NIX_LIB_DIR', '${LIBPREFIX}mongoclient${LIBSUFFIX}')
 
 for x in clientHeaderDirectories:
     env.Install(prefix + "/include/mongo/" + x,