apache2-prefork-dev 2.2.22-6ubuntu5 (i386 binary) in ubuntu saucy

 This package provides the development headers and apxs2 binary for
 apache2-mpm-prefork; see the apache2 package description for more details.
 .
 This should only be used when you absolutely *must* support a non-threaded
 environment (for PHP, for example).