> try
>
> yum install postgresql-devel
>

I allready have that:

yum install postgresql-devel
Loaded plugins: presto, refresh-packagekit
Setting up Install Process
Package postgresql-devel-8.4.2-1.fc12.i686 already installed and
latest version
Nothing to do

The file is here: /usr/include/libpq-fe.h

but this doesn't work:

gem install pg -- --with-pgsql-include-dir=/usr/include
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
        ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb --with-pgsql-include-dir=/usr/include
checking for pg_config... yes
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/bin/ruby
        --with-pg
        --without-pg
        --with-pg-config
        --without-pg-config
        --with-pg-dir
        --without-pg-dir
        --with-pg-include
        --without-pg-include=${pg-dir}/include
        --with-pg-lib
        --without-pg-lib=${pg-dir}/lib
        --enable-static-build
        --disable-static-build


Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
pg-0.9.0 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.9.0/ext/
gem_make.out
[r...@458869-mitll ext]#

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