Index: trunk/Config.kmk
===================================================================
--- trunk/Config.kmk	(revision 3571)
+++ trunk/Config.kmk	(revision 3572)
@@ -124,4 +124,11 @@
  TOOL_FLEX_LEX = gflex
 endif
+# Not all compiler tools currently do the same quoting of DEFS, so here's a
+# temporary workaround.
+ifn1of ($(KBUILD_TARGET), win)
+ TMP_QUOTE_SLASH :=
+else
+ TMP_QUOTE_SLASH := \$(NO_SUCH_VARIABLE)
+endif
 
 #
@@ -183,6 +190,6 @@
 
 DEFS += \
-	KBUILD_PATH=\"/$(patsubst %/,%,$(MY_INST_DATA))\" \
-	KBUILD_BIN_PATH=\"/$(patsubst %/,%,$(MY_INST_BIN))\"
+	KBUILD_PATH=$(TMP_QUOTE_SLASH)"/$(patsubst %/,%,$(MY_INST_DATA))$(TMP_QUOTE_SLASH)" \
+	KBUILD_BIN_PATH=$(TMP_QUOTE_SLASH)"/$(patsubst %/,%,$(MY_INST_BIN))$(TMP_QUOTE_SLASH)"
 endif
 
Index: trunk/src/kmk/Makefile.kmk
===================================================================
--- trunk/src/kmk/Makefile.kmk	(revision 3571)
+++ trunk/src/kmk/Makefile.kmk	(revision 3572)
@@ -39,5 +39,5 @@
 	$(TEMPLATE_BIN_DEFS) \
 	KBUILD_SVN_REV=$(KBUILD_SVN_REV) \
-	KBUILD_TYPE=\"$(KBUILD_TYPE)\"
+	KBUILD_TYPE=$(TMP_QUOTE_SLASH)"$(KBUILD_TYPE)$(TMP_QUOTE_SLASH)"
 TEMPLATE_BIN-KMK_DEPS = \
 	$(kmk_0_OUTDIR)/config.h \
@@ -235,7 +235,7 @@
 	CONFIG_WITH_MEMORY_OPTIMIZATIONS \
 	\
-	KBUILD_HOST=\"$(KBUILD_TARGET)\" \
-	KBUILD_HOST_ARCH=\"$(KBUILD_TARGET_ARCH)\" \
-	KBUILD_HOST_CPU=\"$(KBUILD_TARGET_CPU)\"
+	KBUILD_HOST=$(TMP_QUOTE_SLASH)"$(KBUILD_TARGET)$(TMP_QUOTE_SLASH)" \
+	KBUILD_HOST_ARCH=$(TMP_QUOTE_SLASH)"$(KBUILD_TARGET_ARCH)$(TMP_QUOTE_SLASH)" \
+	KBUILD_HOST_CPU=$(TMP_QUOTE_SLASH)"$(KBUILD_TARGET_CPU)$(TMP_QUOTE_SLASH)"
 # kmk_DEFS += CONFIG_WITH_COMPILER  # experimental, doesn't work 101% right it seems.
 kmk_DEFS.x86 = CONFIG_WITH_OPTIMIZATION_HACKS