From 72169ab3b50f755c9ee8782f18d620756ed4b70f Mon Sep 17 00:00:00 2001
From: "Jason W. Bacon" <bacon4000@gmail.com>
Date: Tue, 18 Feb 2025 09:26:13 -0600
Subject: [PATCH] Makefile:     Add install targets with DESTDIR support    
 More portable default compilers     Clean up and document

---
 Makefile | 49 +++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 39 insertions(+), 10 deletions(-)

diff --git a/Makefile b/Makefile
index 6c5fd22..05e62e6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,22 +1,51 @@
+# Use ?= to allow overriding from the env or command-line, e.g.
+#
+#       make CXX=c++ CXXFLAGS="-O3 -fPIC" install
+#
+# Package managers will override many of these variables automatically, so
+# this is aimed at making it easy to create packages (Debian packages,
+# FreeBSD ports, MacPorts, pkgsrc, etc.)
 
-CC ?=	gcc
-CXX ?=	g++
+# Default to the default compiler on all *nix systems
+# cc is gcc on GNU/Linux systems, and clang on FreeBSD, macOS, ...
+# c++ is g++ on GNU/Linux systems, and clang++ on FreeBSD, macOS, ...
+CC	?= cc
+CXX	?= c++
+# Support for GNU DESTDIR staged installs.  DESTDIR and PREFIX are
+# provided by most package managers, so this should work out of the box.
+DESTDIR	?= stage
+PREFIX	?= /usr/local
+MKDIR	?= mkdir
+INSTALL	?= install -c
+STRIP	?= strip
 
-all: multichoose multipermute
+BINS	= multichoose multipermute cmultichoose
+
+.PHONY: all install install-strip clean
+
+all: ${BINS}
 
 #multichoose_recursive: multichoose_recursive.cpp
-#	${CXX} $(LDFLAGS) $(CPPFLAGS) $(CXXFLAGS) multichoose_recursive.cpp -o multichoose_recursive
+#	${CXX} ${LDFLAGS} ${CPPFLAGS} ${CXXFLAGS} multichoose_recursive.cpp -o multichoose_recursive
 
 multichoose: multichoose.cpp multichoose.h
-	${CXX} $(LDFLAGS) $(CPPFLAGS) $(CXXFLAGS) multichoose.cpp -o multichoose
+	${CXX} ${LDFLAGS} ${CPPFLAGS} ${CXXFLAGS} multichoose.cpp -o multichoose
 
 multipermute: multipermute.cpp multipermute.h
-	${CXX} $(LDFLAGS) $(CPPFLAGS) $(CXXFLAGS) multipermute.cpp -o multipermute
+	${CXX} ${LDFLAGS} ${CPPFLAGS} ${CXXFLAGS} multipermute.cpp -o multipermute
 
 cmultichoose: multichoose.c
-	${CC} $(LDFLAGS) $(CPPFLAGS) $(CXXFLAGS) multichoose.c -o cmultichoose
+	${CC} ${LDFLAGS} ${CPPFLAGS} ${CXXFLAGS} multichoose.c -o cmultichoose
+
+install: all
+	${MKDIR} -p ${DESTDIR}${PREFIX}/bin
+	${MKDIR} -p ${DESTDIR}${PREFIX}/include/multichoose
+	${INSTALL} ${BINS} ${DESTDIR}${PREFIX}/bin
+	${INSTALL} *.py ${DESTDIR}${PREFIX}/bin
+	${INSTALL} *.h ${DESTDIR}${PREFIX}/include/multichoose
+
+install-strip: install
+	${STRIP} ${DESTDIR}${PREFIX}/bin/*e
 
 clean:
-	rm -f cmultichoose
-	rm -f multichoose
-	rm -f multipermute
+	rm -rf ${BINS} ${DESTDIR}