--- world-of-goo-1.41-r1.ebuild.orig	2013-01-13 20:31:16 +0900
+++ world-of-goo-1.41-r1.ebuild.orig	2014-01-10 13:40:14 +0900
@@ -47,7 +47,7 @@ 
 
 src_install() {
 	exeinto "${dir}"
-	doexe ${MY_PN%Demo}* || die
+	doexe ${MY_PN%Demo}.$(usex amd64 bin64 bin32) || die
 
 	games_make_wrapper ${PN} "${dir}"/${MY_PN%Demo} || die