# Rice: ERROR: Failed to build gem native extension **URL:** \ **Category:** Ruby\ **Created:** [February 9, 2009, 9:18pm UTC](https://www.ruby-forum.com/t/rice-error-failed-to-build-gem-native-extension/159896 "2009-02-09T21:18:58Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![kungfu-free](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/edb3f5/32.png) [@kungfu-free](https://www.ruby-forum.com/u/kungfu-free)\ **Post date:** [February 9, 2009, 9:18pm UTC](https://www.ruby-forum.com/t/rice-error-failed-to-build-gem-native-extension/159896/1 "2009-02-09T21:18:58Z")
Hello, folks rubyists ! I report there after some error (2) that I encounter. In case someone meet the same or has already met it ! I don’t really need a solution so don’t bother investigating too much on it ! cheers * * * /usr/bin/gem1.9 install rdoc RedCloth rice rspec rubyforge RubyInline Successfully installed rdoc-2.3.0 Building native extensions. This could take a while… Successfully installed RedCloth-4.1.1 Building native extensions. This could take a while… ERROR: Error installing rice: ERROR: Failed to build gem native extension. sh ./configure --prefix=/var/lib/gems/1.9.0/gems/rice-1.0.2/ruby/lib checking for a BSD-compatible install… /usr/bin/install -c checking whether build environment is sane… yes checking for a thread-safe mkdir -p… /bin/mkdir -p checking for gawk… gawk checking whether make sets $(MAKE)… yes checking for g++… g++ 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 g++ accepts -g… yes checking for style of include used by make… GNU checking dependency style of g++… gcc3 checking for ranlib… ranlib checking build system type… i686-pc-linux-gnu checking host system type… i686-pc-linux-gnu checking for ruby.h… no configure: error: could not find ruby.h (check config.log) Gem files will remain installed in /var/lib/gems/1.9.0/gems/rice-1.0.2 for inspection. Results logged to /var/lib/gems/1.9.0/gems/rice-1.0.2/gem\_make.out Successfully installed rspec-1.1.12 Successfully installed rubyforge-1.0.2 Successfully installed ZenTest-3.11.1 Successfully installed RubyInline-3.8.1 6 gems installed Installing ri documentation for rdoc-2.3.0… Installing ri documentation for RubyInline-3.8.1… Updating ri class cache with 1548 classes… Installing RDoc documentation for rdoc-2.3.0… ERROR: While generating documentation for rdoc-2.3.0 … MESSAGE: Error while evaluating /var/lib/gems/1.9.0/gems/rdoc-2.3.0/lib/rdoc/generator/template/darkfish/classpage.rhtml: undefined method `each' for # (at "r\">Namespace\n\t\t\t\t