diff -r 7129b977c4af -r 01cc48ed67f3 common/autoconf/help.m4
--- a/common/autoconf/help.m4	Fri May 04 11:00:26 2018 +0100
+++ b/common/autoconf/help.m4	Wed May 16 15:52:51 2018 -0700
@@ -197,7 +197,10 @@
     printf "* Environment:    $WINDOWS_ENV_VENDOR version $WINDOWS_ENV_VERSION (root at $WINDOWS_ENV_ROOT_PATH)\n"
   fi
   printf "* Boot JDK:       $BOOT_JDK_VERSION (at $BOOT_JDK)\n"
-  printf "* Toolchain:      $TOOLCHAIN_TYPE ($TOOLCHAIN_DESCRIPTION)\n"
+  if test "x$TOOLCHAIN_VERSION" != "x"; then
+    print_version=" $TOOLCHAIN_VERSION"
+  fi
+  printf "* Toolchain:      $TOOLCHAIN_TYPE ($TOOLCHAIN_DESCRIPTION$print_version)\n" 
   printf "* C Compiler:     Version $CC_VERSION_NUMBER (at $CC)\n"
   printf "* C++ Compiler:   Version $CXX_VERSION_NUMBER (at $CXX)\n"