--- pigz-2.4/Makefile.orig	2018-06-06 19:38:13.206226284 +0000
+++ pigz-2.4/Makefile	2018-06-06 19:44:55.993031070 +0000
@@ -5,11 +5,14 @@
 ZOPFLI=zopfli/src/zopfli/
 ZOP=deflate.o blocksplitter.o tree.o lz77.o cache.o hash.o util.o squeeze.o katajainen.o
 
+BINDIR?=/usr/bin
+MANDIR?=/usr/share/man
+
 # use gcc and gmake on Solaris
 
 pigz: pigz.o yarn.o try.o $(ZOP)
 	$(CC) $(LDFLAGS) -o pigz pigz.o yarn.o try.o $(ZOP) $(LIBS)
-	ln -f pigz unpigz
+	ln -sf pigz unpigz
 
 pigz.o: pigz.c yarn.h try.h $(ZOPFLI)deflate.h $(ZOPFLI)util.h
 
@@ -98,6 +101,13 @@
 pigz.pdf: pigz.1
 	groff -mandoc -f H -T ps pigz.1 | ps2pdf - pigz.pdf
 
+install:
+	@mkdir -p $(DESTDIR)$(BINDIR)
+	@install -m0755 pigz $(DESTDIR)$(BINDIR)
+	@install -m0755 unpigz $(DESTDIR)$(BINDIR)
+	@mkdir -p $(DESTDIR)$(MANDIR)/man1
+	@install -m0644 pigz.1 $(DESTDIR)$(MANDIR)/man1
+
 all: pigz pigzj pigzt pigzn docs
 
 clean: