Create directory hard links on Mac OS X

.gitignore

hlink.o
hlink

hlink.c

/* Credit goes to http://bit.ly/fyXkcg */

#include <unistd.h>
#include <stdio.h>

int main(int argc, char* argv[]) {
	if (argc != 3) {
		fprintf(stderr,"Use: hlink <src_dir> <target_dir>\n");
		return 1;
	}
	int ret = link(argv[1],argv[2]);
	if (ret != 0)
		perror("link");
	return ret;
}

Makefile

.PHONY: clean

%.c.o:

hlink: hlink.o
	${CC} ${LDFLAGS} $^ -o $@

clean:
	-rm hlink.o hlink