Bug#258252: /usr/lib/apache2/modules/mod_ssl.so: mod_ssl.so fails with "undefined symbol: X509_free"

[Moritz Bunkus <mosu@p15097576.pureserver.info>]

Package: apache2-common
Version: 2.0.50-1
Severity: important
File: /usr/lib/apache2/modules/mod_ssl.so

After upgrading apache2 from 2.0.4x to 2.0.50 it did not start anymore. Loading aborts with this error message:
Cannot load /usr/lib/apache2/modules/mod_ssl.so into server: /usr/lib/apache2/modules/mod_ssl.so: undefined symbol: X509_free

Re-compiling the package on my system did not help either.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.26
Locale: LANG=C, LC_CTYPE=de_DE@euro

Versions of packages apache2-common depends on:
ii  debconf                     1.4.29       Debian configuration management sy
ii  debianutils                 2.8.3        Miscellaneous utilities specific t
ii  libapr0                     2.0.50-1     The Apache Portable Runtime
ii  libc6                       2.3.2.ds1-13 GNU C Library: Shared libraries an
ii  libdb4.2                    4.2.52-16    Berkeley v4.2 Database Libraries [
ii  libexpat1                   1.95.6-8     XML parsing C library - runtime li
ii  libldap2                    2.1.30-1     OpenLDAP libraries
ii  libmagic1                   4.09-1       File type determination library us
ii  libssl0.9.7                 0.9.7d-3     SSL shared libraries
ii  mime-support                3.26-1       MIME files 'mime.types' & 'mailcap
ii  net-tools                   1.60-10      The NET-3 networking toolkit
ii  openssl                     0.9.7d-3     Secure Socket Layer (SSL) binary a
ii  ssl-cert                    1.0-8        Simple debconf wrapper for openssl
ii  zlib1g                      1:1.2.1.1-3  compression library - runtime

-- no debconf information