This makefile was designed as a "drop in" replacement for the file GNUmakefile in repo https://github.com/ibara/mg. The idea is to have a common makefile that can be used by both gmake and BSD make. Two problems I ran into: one, versions of gmake before Apr 2011 do NOT support `!=`; two, NetBSD system make's implicit rule for `.c.o` puts all `.o…

Makefile-for-mg-nonGNU

# Mg portable GNUmakefile
# This file written by Brian Callahan <bcallah@openbsd.org>
# and released into the Public Domain.

PROG = mg

PREFIX ?= /usr/local
MANDIR ?= ${PREFIX}/man
DOCDIR ?= ${PREFIX}/share/doc/mg
INSTALL = /usr/bin/install

# CFLAGS:
# -DREGEX	-- Enable regex search commands
# -DSTARTUPFILE	-- Look for and handle initialization file
CFLAGS ?= -O2 -pipe
CFLAGS += -Wall -DREGEX

LIBS = -lcurses

OBJS =	autoexec.o basic.o bell.o buffer.o cinfo.o dir.o display.o \
	echo.o extend.o file.o fileio.o funmap.o help.o kbd.o keymap.o \
	line.o macro.o main.o match.o modes.o paragraph.o re_search.o \
	region.o search.o spawn.o tty.o ttyio.o ttykbd.o undo.o util.o \
	version.o window.o word.o yank.o

#
# More or less standalone extensions.
#
OBJS +=	cmode.o cscope.o dired.o grep.o tags.o

#
# Extensions unique to Mg portable.
#
OBJS +=	extensions.o

#
# Mg portable setup.
#
Linux_CFLAGS	= -D_GNU_SOURCE -D__dead="__attribute__((__noreturn__))" -Dst_mtimespec=st_mtim
Linux_OBJS	= portable/linux/fgetln.o portable/common/fparseln.o \
		  portable/common/reallocarray.o portable/linux/strlcat.o \
		  portable/linux/strlcpy.o portable/common/strtonum.o
Darwin_CFLAGS	= -DMSG_NOSIGNAL=SO_NOSIGPIPE -DLOGIN_NAME_MAX=MAXLOGNAME
Darwin_OBJS	= portable/common/fparseln.o portable/common/futimens.o \
		  portable/common/reallocarray.o portable/common/strtonum.o
Darwin_LIBS	= -lutil
FreeBSD_CFLAGS	= -D__dead=__dead2 -DLOGIN_NAME_MAX=MAXLOGNAME
FreeBSD_OBJS	= portable/common/reallocarray.o
FreeBSD_LIBS	= -lutil
OpenBSD_LIBS	= -lutil
NetBSD_OBJS	= portable/common/reallocarray.o portable/common/strtonum.o
DragonFly_CFLAGS = -D__dead=__dead2 -DLOGIN_NAME_MAX=MAXLOGNAME
DragonFly_OBJS   = portable/common/reallocarray.o
DragonFly_LIBS   = -lutil
Bitrig_LIBS	= -lutil
Cygwin_CFLAGS	= -D_GNU_SOURCE -D__dead="__attribute__((__noreturn__))" -Dst_mtimespec=st_mtim
Cygwin_OBJS	= portable/linux/fgetln.o portable/common/fparseln.o \
		  portable/common/reallocarray.o portable/linux/strlcat.o \
		  portable/linux/strlcpy.o portable/common/strtonum.o
UNAME_S != uname -s | sed 's/^CYGWIN.*$$/Cygwin/'
CFLAGS	+= $($(UNAME_S)_CFLAGS)
OBJS	+= $($(UNAME_S)_OBJS)
LIBS	+= $($(UNAME_S)_LIBS)

.c.o:
	$(CC) $(CFLAGS) -c -o $@ $<

all: ${OBJS}
	${CC} -o ${PROG} ${OBJS} ${LIBS}

install: all
	${INSTALL} -d -m 755 ${DESTDIR}${PREFIX}/bin
	${INSTALL} -d -m 755 ${DESTDIR}${MANDIR}/man1
	${INSTALL} -d -m 755 ${DESTDIR}${DOCDIR}
	${INSTALL} -s -m 555 ${PROG} ${DESTDIR}${PREFIX}/bin
	${INSTALL} -m 444 mg.1 ${DESTDIR}${MANDIR}/man1/${PROG}.1
	${INSTALL} -m 444 README.md ${DESTDIR}${DOCDIR}
	${INSTALL} -m 444 README-Mg ${DESTDIR}${DOCDIR}
	${INSTALL} -m 444 tutorial ${DESTDIR}${DOCDIR}

uninstall:
	rm -f ${DESTDIR}${PREFIX}/bin/${PROG} \
		${DESTDIR}${MANDIR}/man1/${PROG}.1
	rm -rf ${DESTDIR}${DOCDIR}

clean:
	rm -f ${PROG} ${OBJS}