Skip to main content

can’t find the ‘libpq-fe.h header *** extconf.rb failed ***

can't find the 'libpq-fe.h header *** extconf.rb failed ***, you may find this when you get error installing pg gem in your ruby environment.

What is the Problem with libpq-fe.h?


When you try install gem pg in your Ruby environment on your mac machine, it has dependency over library with name libpq-fe.h(libpq-dev) which is not installed on your machine. That's why it shows the error message.
Terminal Log

You might have similar terminal error log as given below:

Building native extensions.  This could take a while...
ERROR:  Error installing pg:
ERROR: Failed to build gem native extension.
/Users/username/.rvm/rubies/ruby-2.0.0-p247/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.
.
.

Solution 1:

1. Install Postgres on your machine. (It resolves dependency of library libpq-fe.h shared library)

2. Use following command to install pg gem in your ruby environments

gem install pg -- --with-pg-config=/Applications/Postgres93.app/Contents/MacOS/bin/pg_config

(considering you are trying this on MAC OS X)
In general:

gem install pg -- --with-pg-config='PG_CONFIG_PATH'

Solution 2:

1. Try installing libpq-dev

brew install libpq-dev #OR sudo apt-get install libpq-dev

2. Then try installing pg gem

gem install pg -- --with-pg-config= 'PG_CONFIG_PATH'

Comments

Popular posts from this blog

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).?

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).) In rails?


1)change the gemfile in mysql version
 gem 'mysql2'

2)Change to mysql2 version
 gem 'mysql2','0.3.20'

Active Scaffold : Add radio buttons to your form ruby on rails ?

Active Scaffold : Add radio buttons to your form ruby on rails ?

The way to add radio buttons to your active scaffold create/update from is as shown below

#Controller

class UsersController < ApplicationController
active_scaffold :user do |config|
config.label = “Users”
config.columns = [:name, :gender]
config.columns[:gender].form_ui = :radio
config.columns[:gender].options[:options] = [['Male', '1'], ['Female','2']]
end
end

Get user accessing ip address in rails?

Get user accessing ip address rails?

request.ip ->returns the ip, whether is is a local proxy ip (localhost address) or not.
*request.remote_ip -> is smarter and gets the ip address of the client outside of local proxies.
3)If you are using apache in front of a mongrel, then remote_ip will return the source address of the request, which in this case will be local host because the Apache web server is making the request, so instead put this in your controller:

@remote_ip = request.env["HTTP_X_FORWARDED_FOR"]