qmail: How to fix "undefined reference to crypt'" while compiling qmail with vpopmail? Answer: If you have a problem like this:
./load qmail-tcpto ip.o now.o open.a lock.a substdio.a error.a str.a fs.a auto_qmail.o
/home/vpopmail/lib/libvpopmail.a(vpopmail.o): In function mkpasswd3':
/usr/local/src/vpopmail-5.4.4/vpopmail.c:602: undefined reference to crypt'
/home/vpopmail/lib/libvpopmail.a(vauth.o): In ...