While installing Nokogiri on Ubuntu 12, I got an error:
Installing nokogiri (1.4.4) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/usr/bin/ruby1.9.1 extconf.rb
extconf.rb:10: Use RbConfig instead of obsolete and deprecated Config.
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... yes
checking for xmlParseDoc() in -lxml2... yes
checking for xsltParseStylesheetDoc() in -lxslt... yes
checking for exsltFuncRegister() in -lexslt... 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
compiling html_sax_parser_context.c
compiling xml_io.c
compiling xml_entity_reference.c
compiling xml_schema.c
compiling xml_element_content.c
compiling xml_reader.c
compiling xml_sax_push_parser.c
compiling xml_sax_parser.c
compiling xslt_stylesheet.c
compiling xml_element_decl.c
compiling xml_node.c
compiling xml_cdata.c
compiling xml_processing_instruction.c
compiling xml_entity_decl.c
compiling xml_attribute_decl.c
compiling xml_xpath_context.c
xml_xpath_context.c: In function ‘xpath_generic_exception_handler’:
xml_xpath_context.c:184:3: error: format not a string literal and no format arguments [-Werror=format-security]
cc1: some warnings being treated as errors
make: *** [xml_xpath_context.o] Error 1
Gem files will remain installed in /home/alex/.bundler/tmp/22194/gems/nokogiri-1.4.4 for inspection.
Results logged to /home/alex/.bundler/tmp/22194/gems/nokogiri-1.4.4/ext/nokogiri/gem_make.out
An error occurred while installing nokogiri (1.4.4), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.4.4'` succeeds before bundling.
I already installed libxslt-dev and libxml2-dev, but as you see, it didn’t help.
How do I solve it?
Is there a specific reason you need 1.4.4 instead of the latest 1.5.6? Otherwise I suggest upgrading.
The Nokogiri changelog shows they fixed this in 1.5.4: