# Error Message at Install **URL:** \ **Category:** Ruby-Gnome 2\ **Created:** [January 28, 2013, 12:36am UTC](https://www.ruby-forum.com/t/error-message-at-install/229291 "2013-01-28T00:36:51Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![oscar-alexander](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/e36b37/32.png) [@oscar-alexander](https://www.ruby-forum.com/u/oscar-alexander)\ **Post date:** [January 28, 2013, 12:36am UTC](https://www.ruby-forum.com/t/error-message-at-install/229291/1 "2013-01-28T00:36:51Z")
After I type “rvm all do gem install visualruby” in terminal, I get the following error message: ERROR: Error installing visualruby: ERROR: Failed to build gem native extension. ``` /Users/agajews/.rvm/rubies/ruby-1.9.3-p374/bin/ruby extconf.rb ``` checking for -Wall option to compiler… yes checking for -Waggregate-return option to compiler… yes checking for -Wcast-align option to compiler… yes checking for -Wextra option to compiler… yes checking for -Wformat=2 option to compiler… yes checking for -Winit-self option to compiler… yes checking for -Wlarger-than-65500 option to compiler… yes checking for -Wmissing-declarations option to compiler… yes checking for -Wmissing-format-attribute option to compiler… yes checking for -Wmissing-include-dirs option to compiler… yes checking for -Wmissing-noreturn option to compiler… yes checking for -Wmissing-prototypes option to compiler… yes checking for -Wnested-externs option to compiler… yes checking for -Wold-style-definition option to compiler… yes checking for -Wpacked option to compiler… yes checking for -Wp,-D\_FORTIFY\_SOURCE=2 option to compiler… yes checking for -Wpointer-arith option to compiler… yes checking for -Wswitch-default option to compiler… yes checking for -Wswitch-enum option to compiler… yes checking for -Wundef option to compiler… yes checking for -Wunsafe-loop-optimizations option to compiler… yes checking for -Wwrite-strings option to compiler… 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 cairo… yes checking for rb\_cairo.h… yes checking for Win32 OS… no checking for gtksourceview-2.0… yes \*\*\* 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 –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=/Users/agajews/.rvm/rubies/ruby-1.9.3-p374/bin/ruby –with-pkg-config –without-pkg-config –with-override-variables –without-override-variables /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:239:in `parse_pc': .pc for libxml-2.0 doesn't exist. (RuntimeError) from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:181:in`declaration’ from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:130:in `requires_private' from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:311:in`all\_required\_packages’ from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:195:in `collect_cflags' from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:134:in`cflags’ from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:196:in `block in collect_cflags' from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:195:in`collect’ from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:195:in `collect_cflags' from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:134:in`cflags’ from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:364:in `cflags' from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:415:in`have\_package’ from /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/glib2-1.2.0/lib/mkmf-gnome2.rb:540:in `required_pkg_config_package' from extconf.rb:58:in`’ Gem files will remain installed in /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/gtksourceview2-1.2.0 for inspection. Results logged to /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/gtksourceview2-1.2.0/ext/gtksourceview2/gem\_make.out Please help! ---
**Author:** ![oscar-alexander](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/e36b37/32.png) [@oscar-alexander](https://www.ruby-forum.com/u/oscar-alexander)\ **Post date:** [February 2, 2013, 12:35pm UTC](https://www.ruby-forum.com/t/error-message-at-install/229291/2 "2013-02-02T12:35:37Z")
Hi, In [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) “[ruby-gnome2-devel-en] Error Message at Install” on Mon, 28 Jan 2013 00:36:51 +0100, Alex G. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > After I type “rvm all do gem install visualruby” in terminal, I get the > following error message: > ERROR: Error installing visualruby: > ERROR: Failed to build gem native extension. > /Users/agajews/.rvm/gems/ruby-1.9.3-p374/gems/pkg-config-1.1.4/lib/pkg-config.rb:239:in > `parse\_pc’: .pc for libxml-2.0 doesn’t exist. (RuntimeError) Could you confirm that libxml2-dev package is installed? ## Thanks, kou