Erro na instalação do QMAIL

Pessoal tô instalando no Debian o qmail, mas qdo tento compilar o tcpserver dá o seguinte erro:

/usr/src/qmail/ucspi-tcp-0.88/make

./load tcpserver rules.o remoteinfo.o timeoutconn.o cdb.a \
dns.a time.a unix.a byte.a `cat socket.lib`
tcpserver.o: In function `doit':
tcpserver.c:(.text+0x7a7): undefined reference to `errno'
remoteinfo.o: In function `mywrite':
remoteinfo.c:(.text+0x68): undefined reference to `errno'
remoteinfo.o: In function `myread':
remoteinfo.c:(.text+0x108): undefined reference to `errno'
timeoutconn.o: In function `timeoutconn':
timeoutconn.c:(.text+0x51): undefined reference to `errno'
timeoutconn.c:(.text+0xd4): undefined reference to `errno'
cdb.a(cdb.o):cdb.c:(.text+0xd8): more undefined references to `errno' follow
collect2: ld returned 1 exit status
make: ** [tcpserver] Erro 1