screader version 1.8-5.1ubuntu1 failed to build in oneiric

screader version 1.8-5.1ubuntu1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2711133

Details about the rebuild:
http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20110816-oneiric.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2711133/+files/buildlog_ubuntu-oneiric-amd64.screader_1.8-5.1ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 551 lines into the build log:

tts.c:253:9: warning: ignoring return value of 'system', declared with attribute warn_unused_result [-Wunused-result]
tts.c: In function 'Punctuation':
tts.c:205:16: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result]
gcc -s -lcrypt -o screader screader.o ansi.o fileio.o mark.o misc.o resize.o socket.o search.o tty.o term.o window.o utmp.o loadav.o putenv.o help.o termcap.o input.o attacher.o pty.o process.o display.o comm.o kmapdef.o acls.o scr.o tts.o /usr/lib/libcurses.a /usr/lib/libtermcap.a
process.o: In function `pass2':
process.c:(.text+0xbbd): undefined reference to `crypt'
socket.o: In function `ReceiveMsg':
socket.c:(.text+0x1378): undefined reference to `crypt'
attacher.o: In function `screen_builtin_lck':
attacher.c:(.text+0x2d4): undefined reference to `crypt'
collect2: ld returned 1 exit status
make[1]: *** [screader] Error 1
make[1]: Leaving directory `/build/buildd/screader-1.8'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110823-0911
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/screader-1.8