Rice: ERROR: Failed to build gem native extension

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 #<String:0xb29b2b4> (at "r\">Namespace</h3>\n\t\t\t\t<ul class=\"link-list\">\n\t\t\t\t\t") ... RDOC args: bin lib History.txt Manifest.txt README.txt RI.txt test/test.ja.txt (continuing with the rest of the installation) Installing RDoc documentation for RedCloth-4.1.1... ERROR: While generating documentation for RedCloth-4.1.1 ... MESSAGE: Error while evaluating /var/lib/gems/1.9.0/gems/rdoc-2.3.0/lib/rdoc/generator/template/darkfish/classpage.rhtml: undefined methodeach’ for #String:0xb870bf8 (at
“r”>Namespace\n\t\t\t\t<ul class=“link-list”>\n\t\t\t\t\t")
… RDOC args: lib ext lib/case_sensitive_require CHANGELOG
lib/case_sensitive_require/RedCloth.rb lib/redcloth/erb_extension.rb
lib/redcloth/formatters/base.rb lib/redcloth/formatters/html.rb
lib/redcloth/formatters/latex.rb lib/redcloth/textile_doc.rb
lib/redcloth/version.rb lib/redcloth.rb README
(continuing with the rest of the installation)
Installing RDoc documentation for rspec-1.1.12…
ERROR: While generating documentation for rspec-1.1.12
… 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 #<String:0xb621dd4> (at "r\">Namespace</h3>\n\t\t\t\t<ul class=\"link-list\">\n\t\t\t\t\t") ... RDOC args: lib History.txt License.txt Manifest.txt README.txt TODO.txt examples/failing/README.txt examples/passing/priority.txt spec/spec/runner/empty_file.txt spec/spec/runner/examples.txt spec/spec/runner/failed.txt (continuing with the rest of the installation) Installing RDoc documentation for rubyforge-1.0.2... ERROR: While generating documentation for rubyforge-1.0.2 ... MESSAGE: Error while evaluating /var/lib/gems/1.9.0/gems/rdoc-2.3.0/lib/rdoc/generator/template/darkfish/classpage.rhtml: undefined methodeach’ for #String:0x9ccdd38 (at
“r”>Namespace\n\t\t\t\t<ul class=“link-list”>\n\t\t\t\t\t")
… RDOC args: lib History.txt Manifest.txt README.txt
(continuing with the rest of the installation)
Installing RDoc documentation for ZenTest-3.11.1…
ERROR: While generating documentation for ZenTest-3.11.1
… 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 #String:0xc66969c (at
“r”>Namespace\n\t\t\t\t<ul class=“link-list”>\n\t\t\t\t\t")
… RDOC args: lib History.txt Manifest.txt README.txt
articles/how_to_use_zentest.txt example.txt
(continuing with the rest of the installation)
Installing RDoc documentation for RubyInline-3.8.1…