diff -up qt-everywhere-opensource-src-4.8.6/configure.fix_detection_of_gcc5 qt-everywhere-opensource-src-4.8.6/configure
--- qt-everywhere-opensource-src-4.8.6/configure.fix_detection_of_gcc5	2014-04-10 13:37:08.000000000 -0500
+++ qt-everywhere-opensource-src-4.8.6/configure	2015-02-16 08:36:16.363785377 -0600
@@ -7729,7 +7729,7 @@ case "$XPLATFORM" in
     *-g++*)
 	# Check gcc's version
 	case "$(${QMAKE_CONF_COMPILER} -dumpversion)" in
-	    4*|3.4*)
+	    5*|4*|3.4*)
 		;;
             3.3*)
                 canBuildWebKit="no"
@@ -8031,6 +8031,11 @@ g++*)
         QT_GCC_MINOR_VERSION=`echo $COMPILER_VERSION | sed 's,^\([0-9]*\)\.\([0-9]*\).*,\2,'`
         QT_GCC_PATCH_VERSION=0
         ;;
+    *)
+        QT_GCC_MAJOR_VERSION=$COMPILER_VERSION
+        QT_GCC_MINOR_VERSION=0
+        QT_GCC_PATCH_VERSION=0
+        ;;
     esac
 
     case "$COMPILER_VERSION" in