./configure
[snip]
makegcc -g -O2 -Wall -Wpointer-arith -Wno-uninitialized -I. -I.. -I. -I./..
-I/usr/local/ssl/include  -DHAVE_CONFIG_H -c readpassphrase.c
readpassphrase.c: In function `readpassphrase':
readpassphrase.c:117: warning: implicit declaration of function `write'
readpassphrase.c:119: warning: implicit declaration of function `read'

[snip]

ranlib libopenbsd-compat.a
make[1]: Leaving directory `/usr/local/src/openssh-3.7.1p2/openbsd-compat'
gcc -g -O2 -Wall -Wpointer-arith -Wno-uninitialized -I. -I. -I/usr/local/ssl/i
nclude  -DSSHDIR=\"/usr/local/etc\" -D_PATH_SSH_PROGRAM=\"/usr/local/bin/ssh\"
 -D_PATH_SSH_ASKPASS_DEFAULT=\"/usr/local/libexec/ssh-askpass\" -D_PATH_SFTP_S
ERVER=\"/usr/local/libexec/sftp-server\" -D_PATH_SSH_KEY_SIGN=\"/usr/local/lib
exec/ssh-keysign\" -D_PATH_SSH_PIDDIR=\"/var/run\" -D_PATH_PRIVSEP_CHROOT_DIR=
\"/var/empty\" -DSSH_RAND_HELPER=\"/usr/local/libexec/ssh-rand-helper\" -DHAVE
_CONFIG_H -c authfd.c
authfd.c: In function `ssh_request_reply':
authfd.c:125: `write' undeclared (first use this function)
authfd.c:125: (Each undeclared identifier is reported only once
authfd.c:125: for each function it appears in.)
authfd.c:137: warning: implicit declaration of function `read'
make: *** [authfd.o] Error 1