Thanks for the reply I did the postgresql install using well-known package from Marc Liyanage: http://www.entropy.ch/software/macosx/ I have tried specifying library path when invoking extconf.rb, using this syntax: ruby extconf.rb --with-pgsql-include-dir=/usr/local/pgsql/include \ --with-pgsql-lib-dir=/usr/local/pgsql/lib ...but I still get the same error that it can't find the postgres libs, although I have verified that the libraries in question are present in the specified location. - Thomas In article <E1F7CD79-D89B-11D7-A26A-000A95782782 / forthillcompany.com>, Brian McCallister <mccallister / forthillcompany.com> wrote: > How did you install postgresql? I had to specify the location of the > postgresql libraries when I installed ruby-postgres. > > In my case I had installed postgresql via fink, so the postgres libs > were in /sw/lib/postgresql/ and the includes in /sw/include/postgresql/ > > I don't remember (and don't have sources for ruby-postgres on my system > at the moment) the exact argument so tp extconf.rb but the README or > INSTALL has the info you need to specify the library and include info. > > let me know if this doesn't work and I can figure it out again. > > -Brian >