# How does a GEM get registered when installing one? **URL:** \ **Category:** Ruby\ **Created:** [July 20, 2007, 3:04am UTC](https://www.ruby-forum.com/t/how-does-a-gem-get-registered-when-installing-one/109912 "2007-07-20T03:04:23Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![greg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71c47a/32.png) [@greg](https://www.ruby-forum.com/u/greg)\ **Post date:** [July 20, 2007, 3:04am UTC](https://www.ruby-forum.com/t/how-does-a-gem-get-registered-when-installing-one/109912/1 "2007-07-20T03:04:23Z")
Hi, Can anyone clarify for me how gem’s get registered locally? I’ve installed a gem (RMagick) via source code as opposed to “sudo gem install xxx” and my ruby code can’t find it when I do a “require xxx”??? Some further details below: * * * I’m stuck on rails code being able to reference the RMagick files however, noting I did install RMagick via source code method, not via gem install. Basically if I try to “require ‘RMagick’” it can not locate the file, whereas other require lines for other gems I have work ok. I’ll attach some of the example issues below. My questions are (assuming I’ve got some sort of issue with the source install mechanism not registering RMagick in the gem system [not that I fully understand how this works]): Q1 - How can I uninstall my RMagick installation which I performed using the source based approach? (so I can then try the sudo gem install approach) Q2 - When I try to do a gem install without removing I get the below mentioned error/output? Perhaps this is because gem is finding the source installation? Q3 - Any other advice? how to remove after source install? not listed? greg$ sudo gem uninstall rmagick ERROR: While executing gem … (Gem::InstallError) Unknown gem rmagick-\> 0 greg$ sudo gem install rmagick Building native extensions. This could take a while… ERROR: While executing gem … (Gem::Installer::ExtensionBuildError) ERROR: Failed to build gem native extension. ruby gem\_extconf.rb install rmagick sh configure Configuring RMagick 1.15.7 checking for gcc… gcc checking for C compiler default output file name… a.out checking whether the C compiler works… yes checking whether we are cross compiling… no checking for suffix of executables… checking for suffix of object files… o checking whether we are using the GNU C compiler… yes checking whether gcc accepts -g… yes checking for gcc option to accept ANSI C… none needed checking for ruby… /Applications/Locomotive2/Bundles/standardRailsMar2007.locobundle/i386/bin/ruby checking for Magick-config… no checking for GraphicsMagick-config… no configure: error: Can’t install RMagick. Can’t find Magick-config or GraphicsMagick-config program. RMagick configuration failed with status 1. Gem files will remain installed in /Applications/Locomotive2/Bundles/standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/rmagick- 1.15.7 for inspection. Results logged to /Applications/Locomotive2/Bundles/standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/rmagick- 1.15.7/gem\_make.out * * * Thanks ---
**Author:** ![greg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71c47a/32.png) [@greg](https://www.ruby-forum.com/u/greg)\ **Post date:** [July 20, 2007, 12:51pm UTC](https://www.ruby-forum.com/t/how-does-a-gem-get-registered-when-installing-one/109912/2 "2007-07-20T12:51:35Z")
Greg H. wrote: > checking for Magick-config… no > checking for GraphicsMagick-config… no > configure: error: Can’t install RMagick. Can’t find Magick-config or > GraphicsMagick-config program. > RMagick configuration failed with status 1. Just a quick check - did you install ImageMagick before running this? It looks like that’s what’s causing the problem, although I could be mistaken. Also, it looks like you’re using Locomotive - am I mistaken in thinking that there’s a Locomotive package that includes RMagick and ImageMagick to avoid all this hassle? It’s been a while since I did any Rails work on OS X, so I could be wrong… ---
**Author:** ![greg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71c47a/32.png) [@greg](https://www.ruby-forum.com/u/greg)\ **Post date:** [July 20, 2007, 3:51pm UTC](https://www.ruby-forum.com/t/how-does-a-gem-get-registered-when-installing-one/109912/3 "2007-07-20T15:51:20Z")
tks - I think I’m finding my problem just at the moment - I think it’s due to having multiple installations of ruby on my MacBook. It seems that the RMagick installation has gone into the non-Locomotive ruby area, so this is why my rails problems running in the Locomotive area weren’t picking it up I think…