postgresql-dev 7.5.21 (i386 binary) in ubuntu edgy

 This is a transitional package to automatically migrate to the new
 multicluster/multiversion structure provided by postgresql-common and
 postgresql-<version>. You can safely remove this package after a
 successful installation.
 .
 The former postgresql-dev package has been split up into libpq-dev
 for client-side development and postgresql-server-dev-<version>
 packages for server-side development. However, this package does not
 depend on postgresql-server-dev-<version>.