Unable to install gem on mountain lion?

[wragen22]

Hello,

I'm trying to install a specific gem but getting this error message below.

ERROR:  Error installing nokogiri:
ERROR: Failed to build gem native extension.
        /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h

Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/nokogiri-1.5.5 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/nokogiri-1.5.5/ext/nokogiri/gem_make.out

I've seen that some folks have resolved this issue by reinstalling the new version of x-code.  Which I did - but no avail.

Any tips?

Thanks. 

[Timster]

In new versions of XCode you need to specifically install the command line tools for this to work.

Check here for a screenshot of how to:

http://www.zlu.me/blog/2012/02/21/install-native-ruby-gem-in-mountain-lion-preview/ 

[wragen22]

Hm.. Interesting.  I went and installed the extra extension into xcode.  but now getting a different output.

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb 

checking for libxml/parser.h... yes

checking for libxslt/xslt.h... yes

checking for libexslt/exslt.h... yes

checking for iconv_open() in iconv.h... no

checking for iconv_open() in -liconv... yes

checking for xmlParseDoc() in -lxml2... yes

checking for xsltParseStylesheetDoc() in -lxslt... yes

checking for exsltFuncRegister() in -lexslt... yes

checking for xmlHasFeature()... yes

checking for xmlFirstElementChild()... yes

checking for xmlRelaxNGSetParserStructuredErrors()... yes

checking for xmlRelaxNGSetParserStructuredErrors()... yes

checking for xmlRelaxNGSetValidStructuredErrors()... yes

checking for xmlSchemaSetValidStructuredErrors()... yes

checking for xmlSchemaSetParserStructuredErrors()... yes

creating Makefile

make

/usr/bin/gcc-4.2 -I. -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -DHAVE_XMLHASFEATURE -DHAVE_XMLFIRSTELEMENTCHILD -DHAVE_XMLRELAXNGSETPARSERSTRUCTUREDERRORS -DHAVE_XMLRELAXNGSETPARSERSTRUCTUREDERRORS -DHAVE_XMLRELAXNGSETVALIDSTRUCTUREDERRORS -DHAVE_XMLSCHEMASETVALIDSTRUCTUREDERRORS -DHAVE_XMLSCHEMASETPARSERSTRUCTUREDERRORS -I-I-I/opt/local/include -I-I-I/usr/local/include -I-I-I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include -I-I-I/usr/include -I-I-I/usr/include/libxml2 -I/usr/local/Cellar/libxml2/2.8.0/include/libxml2 -I/opt/local/include/libxml2 -I/usr/local/include/libxml2 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include/libxml2 -I-I/opt/local/include -I-I/usr/local/include -I-I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include -I-I/usr/include -I-I/usr/include/libxml2 -I/opt/local/include -I/usr/local/include -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/include -I/usr/include -I/usr/include/libxml2  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common  -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common   -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline  -c html_document.c

make: /usr/bin/gcc-4.2: No such file or directory

make: *** [html_document.o] Error 1

Gem files will remain installed in /Users/bradwrage/.bundler/tmp/19839/gems/nokogiri-1.5.5 for inspection.

Results logged to /Users/bradwrage/.bundler/tmp/19839/gems/nokogiri-1.5.5/ext/nokogiri/gem_make.out

An error occurred while installing nokogiri (1.5.5), and Bundler cannot continue.

Make sure that `gem install nokogiri -v '1.5.5'` succeeds before bundling.

[wragen22]

Ah...fixed with homebrew and these instructions here.

http://cczona.com/blog/2012/07/fix-for-make-usrbingcc-4-2-no-such-file-or-directory/

Thanks!