PREFIX ?= /usr/local
BINDIR ?= $(PREFIX)/bin
CACHEDIR ?= $(PWD)

.PHONY: all
all: $(CACHEDIR)/exec

.PHONY: install
install: $(CACHEDIR)/exec
	mkdir -p $(BINDIR)
	cp $(CACHEDIR)/exec $(BINDIR)/

$(CACHEDIR)/%: %.c
	gcc -Wall -Os -o $@ $<