I got this error when calling "bundle update":
Installing curb (0.7.10) with native extensions C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:529:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
C:/Ruby192/bin/ruby.exe extconf.rb checking forcurl-config... no checking for main() in -lcurl... no * 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 --without-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=C:/Ruby192/bin/ruby --with-curl-dir --without-curl-dir --with-curl-include --without-curl-include=${curl-dir}/include --with-curl-lib --without-curl-lib=${curl-dir}/lib --with-curllib --without-curllib extconf.rb:23:in `': Can't find libcurl or curl/curl.h (RuntimeError)
Try passing --with-curl-dir or --with-curl-lib and --with-curl-include options to extconf.
Then installed the latest curb version (0.7.12) by myself using DevKit and I can see it on "gem list". However, the bundler still throws the same error trying to install curb 0.7.10 (older version), even though I haven't mentioned "curb" anywhere in my Gemfile.
Where is the problem and how do I solve it?
Windows 7, Ruby 1.92, Rails 3
Found the solution. Just "bundle update curb".