--- qtgui/recoll.pro.in	2017-07-01 08:16:34.000000000 +0200
+++ qtgui/recoll.pro.in	2017-12-17 14:56:27.433648300 +0100
@@ -1,6 +1,13 @@
 TEMPLATE        = app
 LANGUAGE        = C++
 
+QMAKE_CC        = @CC@
+QMAKE_CXX       = @CXX@
+QMAKE_LINK      = @CXX@
+QMAKE_CFLAGS    = @CFLAGS@
+QMAKE_CXXFLAGS  = @CXXFLAGS@
+QMAKE_LFLAGS    = @LDFLAGS@
+
 VPATH = @srcdir@
 DEFINES += BUILDING_RECOLL
 
@@ -160,7 +167,7 @@
 
 unix {
   isEmpty(PREFIX) {
-    PREFIX = /usr/local
+    PREFIX = /usr
   }
   message("Prefix is $$PREFIX")
   DEFINES += PREFIX=\\\"$$PREFIX\\\"
