diff --git a/bacnet-stack/build.bat b/bacnet-stack/build.bat
index 500f65d9..28f839fa 100644
--- a/bacnet-stack/build.bat
+++ b/bacnet-stack/build.bat
@@ -1,10 +1,10 @@
 @echo off
 echo Build with MinGW and MSYS: mingw.sourceforge.net
 rem set PATH=C:\MinGW\msys\1.0\bin;C:\MinGW\bin
+rem assumes rm, cp, size are already in path
 set CC=gcc
 set AR=ar
 set MAKE=make
-set SIZE=size
 make BACNET_PORT=win32 BUILD=release clean all
 
 rem Build for MinGW debug
diff --git a/bacnet-stack/demo/dcc/Makefile b/bacnet-stack/demo/dcc/Makefile
index 7db89e50..3060b9d3 100644
--- a/bacnet-stack/demo/dcc/Makefile
+++ b/bacnet-stack/demo/dcc/Makefile
@@ -22,7 +22,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
diff --git a/bacnet-stack/demo/readprop/Makefile b/bacnet-stack/demo/readprop/Makefile
index 7d58fb51..a9dc49a7 100644
--- a/bacnet-stack/demo/readprop/Makefile
+++ b/bacnet-stack/demo/readprop/Makefile
@@ -3,6 +3,11 @@
 # tools - only if you need them.
 # Most platforms have this already defined
 # CC = gcc
+# AR = ar
+# MAKE = make
+# SIZE = size
+#
+# Assumes rm and cp are available
 
 # Executable file name
 TARGET = bacrp
@@ -23,7 +28,7 @@ ${TARGET_BIN}: ${OBJS} Makefile ${BACNET_LIB_TARGET}
 lib: ${BACNET_LIB_TARGET}
 
 ${BACNET_LIB_TARGET}:
-	( cd ${BACNET_LIB_DIR} ; make clean ; make )
+	( cd ${BACNET_LIB_DIR} ; $(MAKE) clean ; $(MAKE) )
 
 .c.o:
 	${CC} -c ${CFLAGS} $*.c -o $@
@@ -33,6 +38,6 @@ depend:
 	${CC} -MM ${CFLAGS} *.c >> .depend
 
 clean:
-	rm -f core ${TARGET_BIN} ${OBJS} ${BACNET_LIB_TARGET}
+	rm -rf core ${TARGET_BIN} ${OBJS} ${BACNET_LIB_TARGET}
 
 include: .depend