Index: /trunk/kBuild/header.kmk
===================================================================
--- /trunk/kBuild/header.kmk	(revision 3418)
+++ /trunk/kBuild/header.kmk	(revision 3419)
@@ -526,8 +526,8 @@
  ifeq ($(PATH_DEVTOOLS),)
   KBUILD_DEVTOOLS    = $(PATH_ROOT)/tools
- else  
+ else
   KBUILD_DEVTOOLS   := $(PATH_DEVTOOLS)
- endif 
-endif 
+ endif
+endif
 KBUILD_DEVTOOLS_TRG ?= $(KBUILD_DEVTOOLS)/$(KBUILD_TARGET).$(KBUILD_TARGET_ARCH)
 KBUILD_DEVTOOLS_HST ?= $(KBUILD_DEVTOOLS)/$(KBUILD_HOST).$(KBUILD_HOST_ARCH)
@@ -566,10 +566,10 @@
 
 # Deprecated legacy names.
-PATH_DEVTOOLS         ?= $(KBUILD_DEVTOOLS)
-PATH_DEVTOOLS_TRG     ?= $(KBUILD_DEVTOOLS_TRG)
-PATH_DEVTOOLS_BLD     ?= $(KBUILD_DEVTOOLS_TRG)
-PATH_DEVTOOLS_TRG_ALT ?= $(KBUILD_DEVTOOLS_TRG_ALT)
-PATH_DEVTOOLS_HST     ?= $(KBUILD_DEVTOOLS_HST)
-PATH_DEVTOOLS_HST_ALT ?= $(KBUILD_DEVTOOLS_HST_ALT)
+PATH_DEVTOOLS         = $(warning Please replace obsolete PATH_DEVTOOLS with KBUILD_DEVTOOLS)$(KBUILD_DEVTOOLS)
+PATH_DEVTOOLS_TRG     = $(warning Please replace obsolete PATH_DEVTOOLS_TRG with KBUILD_DEVTOOLS_TRG)$(KBUILD_DEVTOOLS_TRG)
+PATH_DEVTOOLS_BLD     = $(warning Please replace obsolete PATH_DEVTOOLS_BLD with KBUILD_DEVTOOLS_BLD)$(KBUILD_DEVTOOLS_TRG)
+PATH_DEVTOOLS_TRG_ALT = $(warning Please replace obsolete PATH_DEVTOOLS_TRG_ALT with KBUILD_DEVTOOLS_TRG_ALT)$(KBUILD_DEVTOOLS_TRG_ALT)
+PATH_DEVTOOLS_HST     = $(warning Please replace obsolete PATH_DEVTOOLS_HST with KBUILD_DEVTOOLS_HST)$(KBUILD_DEVTOOLS_HST)
+PATH_DEVTOOLS_HST_ALT = $(warning Please replace obsolete PATH_DEVTOOLS_HST_ALT with KBUILD_DEVTOOLS_HST_ALT)$(KBUILD_DEVTOOLS_HST_ALT)
 
 # KBUILD_PATH / PATH_KBUILD is determined by kmk.