diff --git a/configure/os/CONFIG.Common.vxWorks-486 b/configure/os/CONFIG.Common.vxWorks-486
index a849735ce..b048a2be4 100644
--- a/configure/os/CONFIG.Common.vxWorks-486
+++ b/configure/os/CONFIG.Common.vxWorks-486
@@ -11,14 +11,13 @@
 include $(CONFIG)/os/CONFIG.Common.vxWorksCommon
 
 # Vx GNU cross compiler suffix
-CMPLR_SUFFIX = 386
+CMPLR_SUFFIX = pentium
  
-ARCH_CLASS = pc486
+ARCH_CLASS = x86
 
-ARCH_DEP_CPPFLAGS = -DCPU=I80486 -D_X86_ 
-ARCH_DEP_CFLAGS = -m486
-ARCH_DEP_CXXFLAGS += -x 'c++' 
-ARCH_DEP_CFLAGS += -fno-defer-pop
+ARCH_DEP_CPPFLAGS = -DCPU=I80486 -D_X86_
+ARCH_DEP_CFLAGS = -mtune=i486 -march=i486
+ARCH_DEP_CFLAGS += -fno-zero-initialized-in-bss -fno-defer-pop
 
 # Allow site overrides
 -include $(CONFIG)/os/CONFIG_SITE.Common.vxWorks-486
diff --git a/configure/os/CONFIG.Common.vxWorks-pentium b/configure/os/CONFIG.Common.vxWorks-pentium
index 324682a97..abec33c6a 100644
--- a/configure/os/CONFIG.Common.vxWorks-pentium
+++ b/configure/os/CONFIG.Common.vxWorks-pentium
@@ -11,12 +11,14 @@
 include $(CONFIG)/os/CONFIG.Common.vxWorksCommon
 
 # Vx GNU cross compiler suffix
-CMPLR_SUFFIX = 386
- 
-ARCH_CLASS = pcPentium
+CMPLR_SUFFIX = pentium
 
-ARCH_DEP_CPPFLAGS = -DCPU=PENTIUM -D_X86_ 
-ARCH_DEP_CFLAGS = -mpentium
-ARCH_DEP_CXXFLAGS += -x 'c++' 
-ARCH_DEP_CFLAGS += -fno-defer-pop
+ARCH_CLASS = x86
+
+ARCH_DEP_CPPFLAGS = -DCPU=PENTIUM -D_X86_
+ARCH_DEP_CFLAGS = -mtune=pentium -march=pentium
+ARCH_DEP_CFLAGS += -fno-zero-initialized-in-bss -fno-defer-pop
+
+# Allow site overrides
+-include $(CONFIG)/os/CONFIG_SITE.Common.vxWorks-pentium