freebsd-dev/crypto/openssh/freebsd-configure.sh

#!/bin/sh
#
# $FreeBSD$
#

configure_args="
    --prefix=/usr
    --sysconfdir=/etc/ssh
    --with-pam
    --with-ssl-dir=/usr
    --with-tcp-wrappers
    --with-libedit
    --with-ssl-engine
    --without-xauth
" 

set -e

# make sure configure uses the correct compiler
export CC=$(echo ".include <bsd.lib.mk>" | make -f /dev/stdin -VCC)
export CPP=$(echo ".include <bsd.lib.mk>" | make -f /dev/stdin -VCPP)
unset CFLAGS CPPFLAGS LDFLAGS LIBS

# regenerate configure and config.h.in
autoheader
autoconf

# reset PATH to avoid picking up the wrong libraries
export PATH=/bin:/sbin:/usr/bin:/usr/sbin
unset LD_LIBRARY_PATH

# generate config.h with krb5 and stash it
sh configure $configure_args --with-kerberos5=/usr
mv config.log config.log.orig
mv config.h config.h.orig

# generate config.h without krb5
sh configure $configure_args --without-kerberos5

# extract the difference
echo '/* $Free''BSD$ */' > krb5_config.h
diff -u config.h.orig config.h |
	sed -n '/^-#define/s/^-//p' |
	grep -Ff /dev/stdin config.h.orig >> krb5_config.h