configured with authuserdb only, then gmake on FreeBSD 4.3R:
...
echo '#define SBINDIR "/relay/sbin"' >sbindir.h
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I. -g -O2 -Wall -I.. -I./.. -c
authuserdbpwd.c
authuserdbpwd.c: In function `dochangepwd2':
authuserdbpwd.c:245: warning: implicit declaration of function `signal'
authuserdbpwd.c:245: `SIGCHLD' undeclared (first use in this function)
authuserdbpwd.c:245: (Each undeclared identifier is reported only once
authuserdbpwd.c:245: for each function it appears in.)
authuserdbpwd.c:245: `SIG_DFL' undeclared (first use in this function)
gmake[1]: *** [authuserdbpwd.o] Error 1
gmake[1]: Leaving directory
`/mnt/install/Software/Mail/courier/sqwebmail/sqwebmail-2.1.1.20010618/auth
lib'
gmake: *** [all-recursive] Error 1
*** ERROR gmake