Question

I am trying to install capybara-webkit (0.8.0), but I get the error below, can any body help, I am on ubuntu 11.10.

Installing capybara-webkit (0.8.0) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native
extension.

    /home/sam/.rvm/rubies/ruby-1.9.3-p0/bin/ruby extconf.rb  /usr/bin/qmake /usr/bin/make cd src/ && /usr/bin/qmake

/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0/src/webkit_server.pro
-spec /usr/share/qt4/mkspecs/linux-g++ -o Makefile.webkit_server /usr/bin/make cd src/ && make -f Makefile.webkit_server make[1]:
Entering directory
/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0/src'
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_WEBKIT -DQT_NO_DEBUG
-DQT_WEBKIT_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtWebKit -I/usr/include/qt4 -I. -o RequestedUrl.o RequestedUrl.cpp make[1]: g++: Command not found make[1]: *** [RequestedUrl.o] Error 127
make[1]: Leaving directory
/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0/src’
make: * [sub-src-webkit_server-pro-make_default-ordered] Error 2

make cd src/ && make -f Makefile.webkit_server make[1]: Entering
directory
/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0/src'
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_WEBKIT -DQT_NO_DEBUG
-DQT_WEBKIT_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtWebKit -I/usr/include/qt4 -I. -o RequestedUrl.o RequestedUrl.cpp make[1]: g++: Command not found make[1]: *** [RequestedUrl.o] Error 127
make[1]: Leaving directory
/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0/src’
make: * [sub-src-webkit_server-pro-make_default-ordered] Error 2

Gem files will remain installed in
/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0
for inspection. Results logged to
/home/sam/Documents/RoR/course_builder/CDPATH=/ruby/1.9.1/gems/capybara-webkit-0.8.0/./gem_make.out
An error occured while installing capybara-webkit (0.8.0), and Bundler
cannot continue. Make sure that gem install capybara-webkit -v
'0.8.0' succeeds before bundling.

Answer 1

According to that log you don’t have g++ (the gnu c++ compiler installed) which you’ll need to build the gem’s native extension. You’ll also need the qt development headers