Postgresql not working after upgrade on Mountain Lion

I just upgraded my Macbook to Mountain Lion, but now postgresql is not working. When the rails server starts, the following error message appears:

could not connect to server: No such file or directory (PG::Error) Is the server running locally and accepting connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"? 

-UPDATE- Now I get the following error message:

 $ rails s => Booting Mongrel => Rails 3.1.0 application starting in development on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server Started GET "/" for 127.0.0.1 at 2012-07-29 11:54:46 +0200 PGError (could not connect to server: Connection refused Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused Is the server running on host "localhost" (127.0.0.1) and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused Is the server running on host "localhost" (fe80::1) and accepting TCP/IP connections on port 5432? ): 
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You have make, autconf, automake, binutils, bison, m4 or install a package to build the kernel or reinstall ruby: pg gem '0.14.0' on Mountain Lion fails .

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