Hi.
It's probably missing the Ubuntu GTK2 developer packages.

/Adde

On 2011-02-21 08:24, pp wrote:
> Hi, you might need some extra libraries to build this gem, gobject-2.0 for example.extconf.rb have not found gobject-2.0.
> install all dependencies and try again
>
>> Date: Mon, 21 Feb 2011 11:43:24 +0900
>> From: mindaslab / gmail.com
>> Subject: Problem with installing Ruby GTK
>> To: ruby-talk / ruby-lang.org
>>
>> Hello People,
>>
>> I tried to install Ruby GTK using the following command on my Ubuntu:
>>
>> $ sudo gem install gtk2
>>
>> and it spits out some error as shown:
>>
>> Building native extensions.  This could take a while...
>> ERROR:  Error installing gtk2:
>>   ERROR: Failed to build gem native extension.
>>
>> /usr/local/ruby/bin/ruby extconf.rb
>> checking for GCC... yes
>> checking for rb_define_alloc_func() in ruby.h... yes
>> checking for rb_block_proc() in ruby.h... yes
>> checking for new allocation framework... yes
>> checking for attribute assignment... no
>> checking for Win32 OS... no
>> checking for gobject-2.0... no
>>
>> How to fix it?
>>
>> -- 
>> Posted via http://www.ruby-forum.com/.
>>
>