elfsign version 0.2.2-2build1 failed to build in oneiric

elfsign version 0.2.2-2build1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2692240

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/2692240/+files/buildlog_ubuntu-oneiric-amd64.elfsign_0.2.2-2build1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 243 lines into the build log:

checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether x86_64-linux-gnu-gcc accepts -g... yes
checking for x86_64-linux-gnu-gcc option to accept ANSI C... none needed
checking this systems operating system... Linux
checking for "/usr/include/openssl/objects.h"... yes
checking for "/usr/include/openssl/rsa.h"... yes
checking for "/usr/include/openssl/md5.h"... yes
checking for "/usr/include/openssl/x509.h"... yes
checking for "/usr/include/openssl/pem.h"... yes
checking for "/usr/include/openssl/bio.h"... yes
checking for "/usr/lib/libcrypto.so"... no
configure: error: required openssl library missing
make: *** [config.status] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110820-0857
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/elfsign-0.2.2