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POPostgreSQL gem pg was unable to install
 

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  1. POPostgreSQL gem pg was unable to install
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    <p>My DB is PostgreSQL.I am on CENTOS.... While installing the pg gem I received the following error. I reinstalled to clear my YAML problem also, which didn't work, but it is just a warning. My main problem is the installation of the pg gem:</p> <pre><code>[root@vdimc04 ~]# gem install pg /usr/local/lib/ruby/1.9.1/yaml.rb:56:in `&lt;top (required)&gt;': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb checking for pg_config... no No pg_config... trying anyway. If building fails, please try again with --with-pg-config=/path/to/pg_config 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/local/bin/ruby --with-pg --without-pg --with-pg-dir --without-pg-dir --with-pg-include --without-pg-include=${pg-dir}/include --with-pg-lib --without-pg-lib=${pg-dir}/lib --with-pg-config --without-pg-config --with-pg_config --without-pg_config Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/pg-0.14.1 for inspection. Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/pg-0.14.1/ext/gem_make.out </code></pre> <p>I also tried with the following command, but to no use:</p> <pre><code> gem install pg -- --with-pg-config=/usr/pgsql-9.1/bin/pg_config </code></pre>
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    1. COYou should find and fix the YAML issue too. YAML is used to process configuration files and is very useful to Ruby.
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    2. COi have installed YAML from the link http://pyyaml.org/download/libyaml/yaml-0.1.4 tar.gz
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    3. COcan u say command to uninstall ruby.. i used rpm -e ruby1.9.3-p327 to uninstall but after uninstalling, if i type 'ruby -v' it shows the version name.. Does it mean is it uninstalled properly or not i dont know...
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