From: dejan dimic <dejan.dimic@...>
Date: 2009-07-01T03:45:04+09:00
Subject: Re: Error installing gem

On Jun 30, 8:31 pm, Nabs Kahn <nabus...@gmail.com> wrote:
> Here is the paste from Terminal:
>
> Nabs$ gem install mysql
> WARNING:  Installing to ~/.gem since /Library/Ruby/Gems/1.8 and
>     /usr/bin aren't both writable.
> WARNING:  You don't have /Users/Nabs/.gem/ruby/1.8/bin in your PATH,
>     gem executables will not run.
> Building native extensions.  This could take a while...
> ERROR:  Error installing mysql:
>   ERROR: Failed to build gem native extension.
>
> /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
> extconf.rb
> checking for mysql_query() in -lmysqlclient... no
> checking for main() in -lm... yes
> checking for mysql_query() in -lmysqlclient... no
> checking for main() in -lz... yes
> checking for mysql_query() in -lmysqlclient... no
> checking for main() in -lsocket... no
> checking for mysql_query() in -lmysqlclient... no
> checking for main() in -lnsl... no
> checking for mysql_query() in -lmysqlclient... no
> *** 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=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
>   --with-mysql-config
>   --without-mysql-config
>   --with-mysql-dir
>   --without-mysql-dir
>   --with-mysql-include
>   --without-mysql-include=${mysql-dir}/include
>   --with-mysql-lib
>   --without-mysql-lib=${mysql-dir}/lib
>   --with-mysqlclientlib
>   --without-mysqlclientlib
>   --with-mlib
>   --without-mlib
>   --with-mysqlclientlib
>   --without-mysqlclientlib
>   --with-zlib
>   --without-zlib
>   --with-mysqlclientlib
>   --without-mysqlclientlib
>   --with-socketlib
>   --without-socketlib
>   --with-mysqlclientlib
>   --without-mysqlclientlib
>   --with-nsllib
>   --without-nsllib
>   --with-mysqlclientlib
>   --without-mysqlclientlib
>
> Gem files will remain installed in
> /Users/Nabs/.gem/ruby/1.8/gems/mysql-2.7 for inspection.
> Results logged to /Users/Nabs/.gem/ruby/1.8/gems/mysql-2.7/gem_make.out
> --
> Posted viahttp://www.ruby-forum.com/.

You should try to do it as a root user:
$ sudo gem install mysql