Index: cfe/lib/Driver/ToolChains.cpp
===================================================================
--- cfe/lib/Driver/ToolChains.cpp
+++ cfe/lib/Driver/ToolChains.cpp
@@ -1441,11 +1441,10 @@
     // Then look for distribution supplied gcc installations.
     if (D.SysRoot.empty()) {
       // Look for RHEL devtoolsets.
+      Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
       Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
       Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
       Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
-      Prefixes.push_back("/opt/rh/devtoolset-1.1/root/usr");
-      Prefixes.push_back("/opt/rh/devtoolset-1.0/root/usr");
       // And finally in /usr.
       Prefixes.push_back("/usr");
     }