--- valkyrie-2.0.0/vk_config.pri
+++ valkyrie-2.0.0/vk_config.pri
@@ -14,7 +14,7 @@
 # Set a default value for PREFIX (etc) in the generated makefiles
 # Note: ignore INSTALL_ROOT: it's a qt special, can't be set from here
 isEmpty(PREFIX) {
-  PREFIX = /usr/local
+  PREFIX = /usr
 }
 isEmpty(BINDIR) {
   BINDIR = $$PREFIX/bin