diff --git a/grass/Makefile b/grass/Makefile
index d2ac9f4..9f92975 100644
--- a/grass/Makefile
+++ b/grass/Makefile
@@ -228,18 +228,18 @@ install: FORCE
 		${MAKE} install-macosx; \
 		exit; \
 	fi; \
-	INST_PATH=`dirname ${INST_DIR}`; \
+	INST_PATH=`dirname ${DESTDIR}${INST_DIR}`; \
 	while [ ! -d $$INST_PATH ]; do \
 		INST_PATH=`dirname $$INST_PATH`; \
 	done; \
-	if [ ! -d "${INST_DIR}" -a ! -w "$$INST_PATH" ] ; then \
+	if [ ! -d "${DESTDIR}${INST_DIR}" -a ! -w "$$INST_PATH" ] ; then \
 		echo "ERROR: Directory $$INST_PATH is a parent directory of your"; \
 		echo "  install directory ${INST_DIR} and is not writable."; \
 		echo "  Perhaps you need root access."; \
 		echo "  Installation aborted, exiting Make."; \
 		exit; \
 	fi; \
-	if [ -d ${INST_DIR} -a ! -w "${INST_DIR}" ] ; then \
+	if [ -d ${DESTDIR}${INST_DIR} -a ! -w "${DESTDIR}${INST_DIR}" ] ; then \
 		echo "ERROR: Your install directory ${INST_DIR} is not writable."; \
 		echo "  Perhaps you need root access."; \
 		echo "  Installation aborted, exiting Make."; \
@@ -262,41 +262,41 @@ install: FORCE
 	${MAKE} real-install
 
 real-install: FORCE
-	test -d ${INST_DIR} || ${MAKE_DIR_CMD} ${INST_DIR}
+	test -d ${DESTDIR}${INST_DIR} || ${MAKE_DIR_CMD} ${DESTDIR}${INST_DIR}
 	@##### test -d ${INST_DIR}/dev || ${MAKE_DIR_CMD} ${INST_DIR}/dev
-	test -d ${BINDIR} || ${MAKE_DIR_CMD} ${BINDIR}
-	-sed -e "s#^GISBASE.*#GISBASE=${INST_DIR}#" ${ARCH_BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR} > ${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}
-	-chmod a+x ${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}
+	test -d ${DESTDIR}${BINDIR} || ${MAKE_DIR_CMD} ${DESTDIR}${BINDIR}
+	-sed -e "s#^GISBASE.*#GISBASE=${INST_DIR}#" ${ARCH_BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR} > ${DESTDIR}${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}
+	-chmod a+x ${DESTDIR}${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}
 ifneq ($(strip $(MINGW)),)
-	-sed -e "s#WINGISBASE=.*#WINGISBASE=${INST_DIR}#" ${ARCH_BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}.bat > ${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}.bat
-	-chmod a+x ${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}.bat
+	-sed -e "s#WINGISBASE=.*#WINGISBASE=${INST_DIR}#" ${ARCH_BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}.bat > ${DESTDIR}${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}.bat
+	-chmod a+x ${DESTDIR}${BINDIR}/grass${GRASS_VERSION_MAJOR}${GRASS_VERSION_MINOR}.bat
 endif
-	-cd ${GISBASE} ; tar cBf - $(FILES) | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - bin | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - bwidget | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - docs | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - driver | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - etc | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - fonts | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - man | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - scripts | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - tools | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	if [ ${LOCALE} -eq 1 ] ; then cd ${GISBASE} ; tar cBf - locale | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null ; fi
+	-cd ${GISBASE} ; tar cBf - $(FILES) | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - bin | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - bwidget | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - docs | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - driver | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - etc | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - fonts | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - man | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - scripts | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - tools | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	if [ ${LOCALE} -eq 1 ] ; then cd ${GISBASE} ; tar cBf - locale | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null ; fi
 	@ # The man, include, and lib could go to ${PREFIX}/ BUT if this is
 	@ # done, then the corresponding uninstall instructions must delete
 	@ # the grass files BY FILENAME NOT DIRECTORY!! Otherwise there is a
 	@ # high risk of deleteing system files since PREFIX is defined by
 	@ # default to be /usr/local
 	@##### -cd ${GISBASE} ; tar cBf - man | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - include | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-cd ${GISBASE} ; tar cBf - lib | (cd ${INST_DIR} ; tar xBf - ) 2>/dev/null
-	-sed 's#'${GISBASE}'#'${INST_DIR}'#g' ${GISBASE}/etc/monitorcap > ${INST_DIR}/etc/monitorcap
-	-sed 's#'${GISBASE}'#'${INST_DIR}'#g' ${GISBASE}/etc/fontcap > ${INST_DIR}/etc/fontcap
+	-cd ${GISBASE} ; tar cBf - include | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-cd ${GISBASE} ; tar cBf - lib | (cd ${DESTDIR}${INST_DIR} ; tar xBf - ) 2>/dev/null
+	-sed 's#'${GISBASE}'#'${INST_DIR}'#g' ${GISBASE}/etc/monitorcap > ${DESTDIR}${INST_DIR}/etc/monitorcap
+	-sed 's#'${GISBASE}'#'${INST_DIR}'#g' ${GISBASE}/etc/fontcap > ${DESTDIR}${INST_DIR}/etc/fontcap
 	@##### -chmod -R 1777 ${INST_DIR}/locks 2>/dev/null
-	-chmod -R a+rX ${INST_DIR} 2>/dev/null
+	-chmod -R a+rX ${DESTDIR}${INST_DIR} 2>/dev/null
 	@#GEM installation
-	-tar cBf - gem/skeleton | (cd ${INST_DIR}/etc ; tar xBf - ) 2>/dev/null
-	-${INSTALL} gem/gem$(GRASS_VERSION_MAJOR)$(GRASS_VERSION_MINOR) ${BINDIR} 2>/dev/null
+	-tar cBf - gem/skeleton | (cd ${DESTDIR}${INST_DIR}/etc ; tar xBf - ) 2>/dev/null
+	-${INSTALL} gem/gem$(GRASS_VERSION_MAJOR)$(GRASS_VERSION_MINOR) ${DESTDIR}${BINDIR} 2>/dev/null
 	@# enable OSX Help Viewer
 	@if [ "`cat include/Make/Platform.make | grep -i '^ARCH.*darwin'`" ] ; then /bin/ln -sfh "${INST_DIR}/docs/html" /Library/Documentation/Help/GRASS-${GRASS_VERSION_MAJOR}.${GRASS_VERSION_MINOR} ; fi