got to support both DESTDIR and PREFIX

INSTALL.org

@@ -15,7 +15,8 @@ and you are done.
 
 Other possible targets include:
 
-: make install DESTDIR=/usr	# install into DESTDIR
+: make install PREFIX=/usr	# install into PREFIX
+: make install DESTDIR=/tmp/t	# install into DESTDIR
 : make diet			# compile with diet libc
 : make test			# compile and run the tests
 : make doc			# generate the API documentation using doxygen
@@ -24,5 +25,5 @@ Other possible targets include:
 
 On BSD try this:
 
-: sudo gmake install DESTDIR=/usr/local
+: sudo gmake install PREFIX=/usr/local
 

Makefile

@@ -1,6 +1,8 @@
 .PHONY: doc test bench
 .NOTPARALLEL: clean
 
+export PREFIX="$(DESTDIR)/usr"
+
 indent_args = -nbad -bap -bbo -nbc -br -brs -ncdb -cdw -ce -ci4 -cli0 -cs -d0 -di1 \
 -nfc1 -nfca -hnl -i4 -ip0 -l80 -lp -npcs -nprs -npsl -saf -sai -saw -nsc -nsob -nss
 
@@ -10,15 +12,18 @@ all:
 it: all
 
 destdir:
-	@if test "foo$(DESTDIR)" = "foo" ; then \
+	-@if test "foo$(DESTDIR)" != "foo" ; then \
-            echo "libpsyc install: You must provide a DESTDIR=/usr or such." ;\
-	    exit 2 ;\
-	else true; fi
-	-@if [ ! -w "$(DESTDIR)" ]; then \
 	    mkdir "$(DESTDIR)" ;\
 	fi
-	@if [ ! -w "$(DESTDIR)" ]; then \
+	@if test "foo$(PREFIX)" = "foo" ; then \
-            echo "libpsyc install: You must provide a writable DESTDIR." ;\
+            echo "libpsyc install: You must provide a PREFIX=/usr or such." ;\
+	    exit 2 ;\
+	else true; fi
+	-@if [ ! -w "$(PREFIX)" ]; then \
+	    mkdir "$(PREFIX)" ;\
+	fi
+	@if [ ! -w "$(PREFIX)" ]; then \
+            echo "libpsyc install: You must provide a writable PREFIX." ;\
 	    exit 2 ;\
 	else true; fi
 

d/include/psyc/Makefile

@@ -1,4 +1,4 @@
-includedir = ${DESTDIR}/include/d
+includedir = ${PREFIX}/include/d
 
 INSTALL = install
 HEADERS = common.d parse.d

include/Makefile

@@ -1,4 +1,4 @@
-includedir = ${DESTDIR}/include
+includedir = ${PREFIX}/include
 
 INSTALL = install
 HEADERS = psyc.h

include/psyc/Makefile

@@ -1,6 +1,4 @@
-# Why do we have a Makefile in the include directory?
+includedir = ${PREFIX}/include
-
-includedir = ${DESTDIR}/include
 
 INSTALL = install
 HEADERS = match.h method.h packet.h parse.h render.h text.h uniform.h variable.h

lib/Makefile

@@ -1,4 +1,4 @@
-libdir = ${DESTDIR}/lib
+libdir = ${PREFIX}/lib
 
 INSTALL = install
 LIBS = libpsyc.a libpsyc.so