Error while building native extensions for capybara-webkit

Question

I'm trying to install the webkit driver for capybara on Windows, and I'm getting the following error:

$ gem install capybara-webkit-0.12.1.gem
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing capybara-webkit-0.12.1.gem:
        ERROR: Failed to build gem native extension.

        c:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb


Gem files will remain installed in c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/capybara-webkit-0.12.1 for inspection.
Results logged to c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/capybara-webkit-0.12.1/./gem_make.out

And here's what's in the log file:

C:\>cat c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/capybara-webkit-0.12.1/./gem_make.out
c:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb

I've been trying for some time now to figure out what the problem is. The log file isn't very helpful, and the solutions to similar problems that I found were either specific to Unix or and didn't work for me. I'd appreciate any help you can give me.

Note: This question has been cross-posted to the capybara-webkit Google group.

---

Update: I tried building the gem manually on the recommendation of Joe Ferris on the capybara-webkit Google Group, and managed to get some more detailed information on what's causing the build to fail. Here's the message I get while executing bundle exec rake build in capybara-webkit's directory:

cd src/ && c:/Qt/4.8.3/bin/qmake.exe "c:/Documents and Settings/user/My Documents/Workspace/thoughtbot-capybara-webkit-7289a8e/src/webkit_server.pro" -spec c:/Qt/4.8.3/mkspecs/win32-g++ -o Makefile.webkit_server
'.' is not recognized as an internal or external command,
operable program or batch file.
'.' is not recognized as an internal or external command,
operable program or batch file.
capybara-webkit 0.12.0 built to pkg/capybara-webkit-0.12.0.gem
cd src/ && make -f Makefile.webkit_server 
make[1]: Entering directory `/c/Documents and Settings/user/My Documents/Workspace/thoughtbot-capybara-webkit-7289a8e/src'
make -f Makefile.webkit_server.Release
make[2]: Entering directory `/c/Documents and Settings/user/My Documents/Workspace/thoughtbot-capybara-webkit-7289a8e/src'
bin/rcc.exe -name webkit_server webkit_server.qrc -o release/qrc_webkit_server.cpp
make[2]: bin/rcc.exe: Command not found
make[2]: *** [release/qrc_webkit_server.cpp] Error 127
make[2]: Leaving directory `/c/Documents and Settings/user/My Documents/Workspace/thoughtbot-capybara-webkit-7289a8e/src'
make[1]: *** [release] Error 2
make[1]: Leaving directory `/c/Documents and Settings/user/My Documents/Workspace/thoughtbot-capybara-webkit-7289a8e/src'
make: *** [sub-src-webkit_server-pro-make_default-ordered] Error 2
Command 'make' failed

Other potentially relevant information:

C:\>which make --all
C:\RailsInstaller\DevKit\bin\make.EXE
C:\Qt\4.8.3\bin\make.BAT
C:\Program Files\Gow\bin\make.EXE
C:\>which rcc
C:\Qt\4.8.3\bin\rcc.EXE
C:\>which g++
C:\RailsInstaller\DevKit\mingw\bin\g++.EXE

And my PATH:

C:\PROGRA~1\Serena\vm\win32\bin;
C:\PROGRA~1\Serena\vm\common\bin\win32;
C:\WINDOWS\system32;
C:\WINDOWS;
C:\WINDOWS\System32\Wbem;
C:\Program Files\ATI Technologies\ATI.ACE\;
C:\Program Files\Microsoft SQL Server\80\Tools\Binn\;
C:\WINDOWS\system32\WindowsPowerShell\v1.0;
C:\Program Files\TortoiseSVN\bin;
C:\RailsInstaller\Ruby1.9.3\bin;
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\bin;
C:\RailsInstaller\DevKit\bin;
C:\RailsInstaller\Git\cmd;
C:\Program Files\ansi153\x86;
C:\bin;
C:\RailsInstaller\DevKit\mingw\bin;
C:\Qt\4.8.3\bin;
C:\Program Files\Nodejs;
C:\Documents and Settings\user\Desktop\emacs-23.4\bin;
C:\Python27;
C:\Python27\Scripts;
C:\Program Files\GnuWin32\bin;
C:\Program Files\Gow\bin;
C:\Program Files\Notepad++;
C:\Documents and Settings\user\Application Data\npm\ 

Answer 1

I found a solution here : https://bugreports.qt-project.org/browse/QTBUG-27237

Following this specific workaround make it work on my computer.

It seems to be a bug specific to version 4.8.3, where rcc.exe path is not found correctly.

Also, you might encounter the same error as me after this: It turns out qmake compiled the webkit server into \capybara-webkit-0.12.1\src\release. And capybara-webkit builder expect to get this exe from the "debug" folder, see line 57 of capybara_webkit_builder.rb

I forked the git repository and change this source file to rely on "release" folder instead and it works!

Still, it took me 2 pretty bad workarounds to make it work... Maybe the installation is more straightforward using QT 4.7.X as recommended into the capybara-webkit installation procedure. I should test it.