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Makefile: make it run with BSD make as well

--- a/Makefile

+++ b/Makefile

@@ -1,12 +1,12 @@

 TARGET=pc

 DESTDIR?=

 PREFIX?=/usr/local

-BIN=$(DESTDIR)$(PREFIX)/bin

-MAN=$(DESTDIR)$(PREFIX)/share/man/man1

+BIN=${DESTDIR}${PREFIX}/bin

+MAN=${DESTDIR}${PREFIX}/share/man/man1

 CFLAGS?=-g -O2

 CFLAGS+=-Iinclude -Wall -Wno-missing-braces -Wno-parentheses -Wno-incompatible-pointer-types

-OFILES=\

+OBJS=\

 	libc/dofmt.o\

 	libc/dorfmt.o\

 	libc/encodefmt.o\

@@ -74,26 +74,32 @@

 	libmp/mpvecsub.o\

 	libmp/mpvectscmp.o\

 	libmp/strtomp.o\

-	$(TARGET).o\

+	${TARGET}.o\

 .PHONY: all default install uninstall clean

 all: default

-default: $(TARGET)

+default: ${TARGET}

-install: $(TARGET)

-	install -d $(BIN)

-	install -m 755 $(TARGET) $(BIN)

-	install -d $(MAN)

-	install -m 644 $(TARGET).1 $(MAN)

+install: ${TARGET}

+	install -d ${BIN}

+	install -m 755 ${TARGET} ${BIN}

+	install -d ${MAN}

+	install -m 644 ${TARGET}.1 ${MAN}

 uninstall:

-	rm -f $(BIN)/$(TARGET) $(MAN)/$(TARGET).1

+	rm -f ${BIN}/${TARGET} ${MAN}/${TARGET}.1

 clean:

-	rm -f $(TARGET) $(OFILES) $(TARGET).c

+	rm -f ${TARGET} ${OBJS} ${TARGET}.c

-$(TARGET): $(OFILES)

+${TARGET}: ${OBJS}

+	${CC} -o $@ ${OBJS}

-$(TARGET).c: $(TARGET).y

+pc.c: pc.y

+	yacc -o $@ $<

+

+.SUFFIXES: .c .o

+.c.o:

+	${CC} -o $@ -c $< ${CFLAGS}