My Tracks 2.1 installation that was working on Ubuntu 12.04 was broken on Ubuntu 12.10 upgrade.

Trying to re-install on Ubuntu 12.10, "bundle install" fails with an "-Werror=format-security" error on nokogiri :

"""
Installing nokogiri (1.4.7) 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 xml_comment.c
compiling html_sax_parser_context.c
compiling xml_element_decl.c
compiling nokogiri.c
compiling xml_syntax_error.c
compiling xml_namespace.c
xml_namespace.c: In function ‘prefix’:
xml_namespace.c:14:13: attention : variable ‘doc’ set but not used [-Wunused-but-set-variable]
xml_namespace.c: In function ‘href’:
xml_namespace.c:33:13: attention : variable ‘doc’ set but not used [-Wunused-but-set-variable]
compiling xml_dtd.c
compiling xml_node_set.c
compiling xml_schema.c
compiling xml_encoding_handler.c
compiling xml_document_fragment.c
compiling xml_sax_parser_context.c
compiling html_element_description.c
html_element_description.c: In function ‘get_description’:
html_element_description.c:249:10: attention : cast discards ‘__attribute__((const))’ qualifier from pointer target type [-Wcast-qual]
compiling xml_entity_reference.c
compiling xml_io.c
xml_io.c: In function ‘io_read_callback’:
xml_io.c:28:3: attention : conversion to ‘int’ from ‘size_t’ may change the sign of the result [-Wsign-conversion]
compiling xml_libxml2_hacks.c
compiling xml_reader.c
compiling xml_sax_parser.c
compiling xml_text.c
compiling xml_element_content.c
compiling xml_document.c
compiling xslt_stylesheet.c
compiling xml_cdata.c
compiling html_document.c
compiling xml_relax_ng.c
compiling xml_attribute_decl.c
compiling xml_node.c
compiling xml_sax_push_parser.c
compiling html_entity_lookup.c
compiling xml_processing_instruction.c
compiling xml_attr.c
compiling xml_entity_decl.c
compiling xml_xpath_context.c
xml_xpath_context.c: In function ‘xpath_generic_exception_handler’:
xml_xpath_context.c:184:3: erreur: le format n'est pas une chaîne littérale et pas d'argument de format [-Werror=format-security]
cc1: some warnings being treated as errors
make: *** [xml_xpath_context.o] Erreur 1


Gem files will remain installed in /var/lib/gems/1.9.1/gems/nokogiri-1.4.7 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/nokogiri-1.4.7/ext/nokogiri/gem_make.out
An error occurred while installing nokogiri (1.4.7), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.4.7'` succeeds before bundling.
"""

This first error could be fixed by upgrading to nokogiri 1.5+ (cf. http://stackoverflow.com/questions/13085404/installing-nokogiri-v-1-5-0-gem-in-ubuntu-12-10 ),
but then you get the same error on the mongrel gem.

As suggested in a comment from https://github.com/macournoyer/thin/issues/119 , a workaround is to override the CFLAGS:

"""

1. gem install nokogiri -v '1.4.7' -- --with-cflags=\"-O2 -pipe -march=native -w\"

Building native extensions. This could take a while...
Successfully installed nokogiri-1.4.7
1 gem installed
Installing ri documentation for nokogiri-1.4.7...
Building YARD (yri) index for nokogiri-1.4.7...
Installing RDoc documentation for nokogiri-1.4.7...
"""

and

""""

1. gem install mongrel --pre -- --with-cflags=\"-O2 -pipe -march=native -w\"

Building native extensions. This could take a while...
Successfully installed mongrel-1.2.0.pre2
1 gem installed
Installing ri documentation for mongrel-1.2.0.pre2...
Installing RDoc documentation for mongrel-1.2.0.pre2...
"""

"bundle install" then finishes successfully.