diff --git a/configure/os/CONFIG.Common.vxWorksCommon b/configure/os/CONFIG.Common.vxWorksCommon
index 4fd2725f1..f218337d8 100644
--- a/configure/os/CONFIG.Common.vxWorksCommon
+++ b/configure/os/CONFIG.Common.vxWorksCommon
@@ -86,6 +86,8 @@ VX_GNU_VERSION_6.0 = 3.3.2
 VX_GNU_VERSION_6.1 = 3.3.2
 VX_GNU_VERSION_6.2 = 3.3.2
 VX_GNU_VERSION_6.3 = 3.4.4
+VX_GNU_VERSION_6.4 = 3.4.4
+VX_GNU_VERSION_6.5 = 3.4.4
 VX_GNU_VERSION = $(VX_GNU_VERSION_$(VXWORKS_VERSION))
 
 #--------------------------------------------------