--- p1/Makefile.orig	2017-02-14 21:40:20.404249126 +0100
+++ p1/Makefile	2017-02-19 23:38:43.880414077 +0100
@@ -66,37 +66,42 @@
 # systems the large file compile environment itself might be buggy or beta.
 #LARGEFILEFLAGS=
 LARGEFILEFLAGS=-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
 
 # even more warnings flags..
 MW=
 #MW=-Wtraditional -Wcast-qual -Wcast-align -Wconversion -pedantic -Wlong-long -Wimplicit -Wuninitialized -W -Wshadow -Wsign-compare -Wstrict-prototypes -Wmissing-declarations
 
 CFLAGS1 = -Wall -Wstrict-prototypes -s -O2 -fomit-frame-pointer ${LARGEFILEFLAGS} ${MW}
 
-CC=gcc
+#CC=gcc
 
 CFLAGS = ${CFLAGS1} $1 $2 $3 $4 $5 $6 $7 $8 $9 $a $b $c $d $e ${e2} $f $g $I
 LDFLAGS =
 
 afio : afio.o compfile.o exten.o match.o $M
 	${CC} ${LDFLAGS} afio.o compfile.o exten.o match.o $M -o afio
 
 clean:
 	rm -f *.o afio 
 	rm -f regtest/cmpstat regtest/makesparse
 	rm -f regtest/statsize regtest/statsize64
 	cd regtest; /bin/sh regtest.clean
 
+ifndef DESTDIR
+install:
+	$(error Please specify install prefix as $$DESTDIR)
+else
 install: afio
-	cp afio /usr/local/bin
-	cp afio.1 /usr/share/man/man1
+	install -Dm755 afio $(DESTDIR)/bin/afio
+	install -Dm644 afio.1 $(DESTDIR)/share/man/man1/afio.1
+endif
 
 # generate default list of -E extensions from manpage
 # note: on sun, I had to change awk command below to nawk or gawk
 # to get it to work.
 exten_default.h : afio.1
 		awk -f exten_make.awk afio.1 >exten_default.h
 
 
 afio.o : afio.h patchlevel.h
 compfile.o : afio.h