diff --git a/configure/CONFIG_COMMON b/configure/CONFIG_COMMON
index 3d31e2c39..ed6210bb0 100644
--- a/configure/CONFIG_COMMON
+++ b/configure/CONFIG_COMMON
@@ -291,6 +291,10 @@ PATH_FILTER = $(1)
 COMPILE.c = $(CC) -c $(CPPFLAGS) $(CFLAGS) $(call PATH_FILTER,$(INCLUDES)) $(SOURCE_FLAG)
 COMPILE.cpp = $(CCC) -c $(CPPFLAGS) $(CXXFLAGS) $(call PATH_FILTER,$(INCLUDES)) $(SOURCE_CXXFLAG)
 
+#--------------------------------------------------
+# C preprocessor command
+PREPROCESS.cpp = $(CPP) $(CPPFLAGS) $(INCLUDES) $< > $@
+
 #--------------------------------------------------
 # Depends command
 
diff --git a/configure/os/CONFIG.Common.vxWorksCommon b/configure/os/CONFIG.Common.vxWorksCommon
index e8b803f7a..4d23868d8 100644
--- a/configure/os/CONFIG.Common.vxWorksCommon
+++ b/configure/os/CONFIG.Common.vxWorksCommon
@@ -134,6 +134,11 @@ LINK.cpp += $(PROD_LDFLAGS) $(PROD_LD_OBJS) $(PROD_LD_RESS) $(PROD_LDLIBS)
 CFLAGS_ctdt = $(filter-out -pedantic,$(CFLAGS)) -fdollars-in-identifiers
 COMPILE.ctdt = $(CC) -c $(CPPFLAGS) $(CFLAGS_ctdt) $(call PATH_FILTER,$(INCLUDES)) $(SOURCE_FLAG)
 
+#--------------------------------------------------
+# C preprocessor command
+VXCPPFLAGS = $(filterout $(OP_SYS_INCLUDE_CPPFLAGS),$(CPPFLAGS))
+PREPROCESS.cpp = $(CPP) $(VXCPPFLAGS) $(INCLUDES) $< > $@
+
 #--------------------------------------------------
 # Allow site overrides
 -include $(CONFIG)/os/CONFIG_SITE.Common.vxWorksCommon
diff --git a/configure/os/CONFIG.win32-x86-borland.win32-x86-borland b/configure/os/CONFIG.win32-x86-borland.win32-x86-borland
index f23e4d250..f20b2f006 100644
--- a/configure/os/CONFIG.win32-x86-borland.win32-x86-borland
+++ b/configure/os/CONFIG.win32-x86-borland.win32-x86-borland
@@ -84,7 +84,8 @@ OPT_CFLAGS_YES = -k- -H- -R- -O1 -v- -vi
 OPT_CFLAGS_NO =
 
 # OS vendor c preprocessor
-CPP = $(BORLAND_BIN)/cl  /E
+CPP = $(BORLAND_BIN)/cpp32  -Sr
+PREPROCESS.cpp = $(CPP) $(CPPFLAGS) $(subst /,\\,$(INCLUDES)) -o$@ $<
 
 # Configure OS vendor C++ compiler
 #