diff --git a/src/toolsComm/flex/Makefile.Host b/src/toolsComm/flex/Makefile.Host
index 459f1cb0a..7240c13c3 100644
--- a/src/toolsComm/flex/Makefile.Host
+++ b/src/toolsComm/flex/Makefile.Host
@@ -15,9 +15,14 @@ SKELETON_FILE=include/flex.skel.static
 #	ARCH_CLASS hp700 needs special flags,
 #	everything else uses default:
 #
-USR_CFLAGS_DEFAULT := -DUSG -DDEFAULT_SKELETON_FILE=\"$(SKELETON_FILE)\"
-USR_CFLAGS_Borland := -DUSG
-USR_CFLAGS_hp700 := -DSCO_UNIX -DDEFAULT_SKELETON_FILE=\"$(SKELETON_FILE)\"
+USR_CFLAGS_DEFAULT := -DUSG
+USR_CFLAGS_hp700 := -DSCO_UNIX
+
+#	This applies to all arch.classes:
+#
+ifneq ($(HOST_ARCH),Borland)
+USR_CFLAGS = -DDEFAULT_SKELETON_FILE=\"$(SKELETON_FILE)\"
+endif
 
 INC += flex.skel.static