psqlODBC is the official PostgreSQL ODBC driver.  It is released under
the Library General PUblic License, or LGPL.

Optional Dependency

unixODBC
  This package will build libiodbc drivers by default, since those are
  the ODBC drivers included with Slackware.  In order to build with
  unixODBC, specify WITH_UNIXODBC=yes on the command line.