In [[Installing and Using GNUstep and Objective-C on Linux]], we covered the steps involved in installing the GNUstep environment on Linux distributions for which pre-built GNUstep packages are available. Unfortunately, very few Linux distributions have pre-hbuilt packages available making it necessary download and build the GNUstep sources.
The purpose of this chapter of [[Objective-C 2.0 Essentials]] is to outline the steps necessary to download and build the GNUstep sources. The process outlined here is known to work on Fedora, Red Hat Enterprise Linux and CentOS. The steps should be largely similar for other Linux distributions, though the exact command to perform package installations may differ from the one used here. For details on how to install specific packages for your chosen Linux distribution it may be necessary to refer to the corresponding documentation.
== Installing gcc and Objective-C Support on Linux ==
* GNUstep Backend
Exception encountered, of type "Error"
[78be61bc] /index.php/Special:MobileDiff/8455 Error from line 434 of /var/www/techotopia/includes/diff/DairikiDiff.php: Call to undefined function each()
Backtrace:
#0 /var/www/techotopia/includes/diff/DairikiDiff.php(544): DiffEngine->diag()
#1 /var/www/techotopia/includes/diff/DairikiDiff.php(344): DiffEngine->compareSeq()
#2 /var/www/techotopia/includes/diff/DairikiDiff.php(227): DiffEngine->diffLocal()
#3 /var/www/techotopia/includes/diff/DairikiDiff.php(721): DiffEngine->diff()
#4 /var/www/techotopia/includes/diff/DairikiDiff.php(859): Diff->__construct()
#5 /var/www/techotopia/includes/diff/DairikiDiff.php(980): MappedDiff->__construct()
#6 /var/www/techotopia/extensions/MobileFrontend/includes/diff/InlineDiffFormatter.php(99): WordLevelDiff->__construct()
#7 /var/www/techotopia/includes/diff/DiffFormatter.php(140): InlineDiffFormatter->changed()
#8 /var/www/techotopia/includes/diff/DiffFormatter.php(111): DiffFormatter->block()
#9 /var/www/techotopia/extensions/MobileFrontend/includes/diff/InlineDifferenceEngine.php(117): DiffFormatter->format()
#10 /var/www/techotopia/includes/diff/DifferenceEngine.php(797): InlineDifferenceEngine->generateTextDiffBody()
#11 /var/www/techotopia/includes/diff/DifferenceEngine.php(728): DifferenceEngine->generateContentDiffBody()
#12 /var/www/techotopia/extensions/MobileFrontend/includes/specials/SpecialMobileDiff.php(241): DifferenceEngine->getDiffBody()
#13 /var/www/techotopia/extensions/MobileFrontend/includes/specials/SpecialMobileDiff.php(135): SpecialMobileDiff->showDiff()
#14 /var/www/techotopia/extensions/MobileFrontend/includes/specials/MobileSpecialPage.php(53): SpecialMobileDiff->executeWhenAvailable()
#15 /var/www/techotopia/includes/specialpage/SpecialPage.php(384): MobileSpecialPage->execute()
#16 /var/www/techotopia/includes/specialpage/SpecialPageFactory.php(553): SpecialPage->run()
#17 /var/www/techotopia/includes/MediaWiki.php(281): SpecialPageFactory::executePath()
#18 /var/www/techotopia/includes/MediaWiki.php(714): MediaWiki->performRequest()
#19 /var/www/techotopia/includes/MediaWiki.php(508): MediaWiki->main()
#20 /var/www/techotopia/index.php(41): MediaWiki->run()
#21 {main}