diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 1dd34ae..a06a8a5 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1442,10 +1442,11 @@
     // 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");
     }