Problem with installing gems

[Elton Yau]

Hey Guys, so i recently started playing around with ROR, however whenever i try to install gems i get this message 

ERROR:  Error installing pg:

ERROR: Failed to build gem native extension.

        /Applications/rubystack-1.9.3-22/ruby/bin/ruby extconf.rb

checking for pg_config... yes

Using config values from /Applications/rubystack-1.9.3-22/postgresql/bin/pg_config

*** 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=/Applications/rubystack-1.9.3-22/ruby/bin/ruby

--with-pg

--without-pg

--with-pg-config

--without-pg-config

--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

/Applications/rubystack-1.9.3-22/ruby/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)

You have to install development tools first.

from /Applications/rubystack-1.9.3-22/ruby/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0'

from /Applications/rubystack-1.9.3-22/ruby/lib/ruby/1.9.1/mkmf.rb:476:in `try_link'

from extconf.rb:39:in `<main>'

Gem files will remain installed in /Applications/rubystack-1.9.3-22/ruby/lib/ruby/gems/1.9.1/gems/pg-0.17.1 for inspection.

Results logged to /Applications/rubystack-1.9.3-22/ruby/lib/ruby/gems/1.9.1/gems/pg-0.17.1/ext/gem_make.out

I dont really get whats happening ...

Thanks !

Elton

[Frederick Cheung]

On Saturday, March 15, 2014 6:35:18 AM UTC, Elton Yau wrote:
> Hey Guys, so i recently started playing around with ROR, however whenever i try to install gems i get this message 
>
>
>
> ERROR:  Error installing pg:
> ERROR: Failed to build gem native extension.
>
>
>         /Applications/rubystack-1.9.3-22/ruby/bin/ruby extconf.rb
> checking for pg_config... yes
> Using config values from /Applications/rubystack-1.9.3-22/postgresql/bin/pg_config
> *** 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.
>

> /Applications/rubystack-1.9.3-22/ruby/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
> You have to install development tools first.
> from /Applications/rubystack-1.9.3-22/ruby/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0'
> from /Applications/rubystack-1.9.3-22/ruby/lib/ruby/1.9.1/mkmf.rb:476:in `try_link'
> from extconf.rb:39:in `<main>'
>
>

You need development tools installed (c compiler etc). Assuming you're on OS X this means installing Xcode and from within Xcode installing the command line tools (on mavericks you run xcode-select --install )

Fred.