diff -r 41300fa6a67c -r f7bc934e204c util/mkspecs/features/warn_on.prf
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/mkspecs/features/warn_on.prf	Wed Mar 31 11:06:36 2010 +0300
@@ -0,0 +1,5 @@
+CONFIG -= warn_off
+QMAKE_CFLAGS += $$QMAKE_CFLAGS_WARN_ON
+QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_WARN_ON
+QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_OBJECTIVE_CFLAGS_WARN_ON
+