# Problem installing Qt4 gem on Windows **URL:** \ **Category:** Ruby\ **Created:** [September 18, 2008, 11:47am UTC](https://www.ruby-forum.com/t/problem-installing-qt4-gem-on-windows/148920 "2008-09-18T11:47:45Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ther](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@ther](https://www.ruby-forum.com/u/ther)\ **Post date:** [September 18, 2008, 11:47am UTC](https://www.ruby-forum.com/t/problem-installing-qt4-gem-on-windows/148920/1 "2008-09-18T11:47:45Z")
Shouldn’t windows gems be precompiled? D:\>gem install qtruby4-1.4.10-x86-mswin32.gem Building native extensions. This could take a while… ERROR: Error installing qtruby4-1.4.10-x86-mswin32.gem: ERROR: Failed to build gem native extension. d:/ruby/bin/ruby.exe extconf.rb install qtruby4-1.4.10-x86-mswin32.gem Executing install… creating Makefile nmake The system cannot execute the specified program. Gem files will remain installed in d:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10 -x86-mswin32 for inspection. Results logged to d:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-x86-mswin32/gem\_ make.out by TheR ---
**Author:** ![ther](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@ther](https://www.ruby-forum.com/u/ther)\ **Post date:** [September 18, 2008, 9:07pm UTC](https://www.ruby-forum.com/t/problem-installing-qt4-gem-on-windows/148920/2 "2008-09-18T21:07:56Z")
Hi Damjan, binaries are included in the Windows qt4 gem, but gem forces to use “nmake” even if nmake does nothing. Thats why nmake is included in this gem, but it is a 2008 version, so you need to install vcredist\_x86 (2008 !!! version), if this does not work please try the 2005 SP1 Version of vcredist\_x86, and please let me know which version works with it Best regards Jan Damjan R. schrieb: > Executing install… > d:/ruby/lib/ruby/gems/1.8/gems/qtruby4-1.4.10-x86-mswin32/gem\_ > make.out > > by > TheR – Otto Software Partner GmbH Jan P. (e-mail: removed\_email\_address@domain.invalid) Tel. 0351/49723202, Fax: 0351/49723119 01067 Dresden, Freiberger Straße 35 - AG Dresden, HRB 2475 Geschäftsführer: Burkhard Arrenberg, Heinz A. Bade, Jens Gruhl ---
**Author:** ![ther](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@ther](https://www.ruby-forum.com/u/ther)\ **Post date:** [September 19, 2008, 8:50am UTC](https://www.ruby-forum.com/t/problem-installing-qt4-gem-on-windows/148920/3 "2008-09-19T08:50:23Z")
Jan P. wrote: > Hi Damjan, > > binaries are included in the Windows qt4 gem, but gem forces to use > “nmake” even if nmake does nothing. Thats why nmake is included in this > gem, but it is a 2008 version, so you need to install vcredist\_x86 (2008 > !!! version), if this does not work please try the 2005 SP1 Version of > vcredist\_x86, and please let me know which version works with it I have instaled Microsoft Visual C++ 2008 Feature Pack Redistributable Package (x86) and now gem installs properly. I am on Vista. gem -v =\> 1.2.0 I will submit a bug on ruby gems project. by TheR ---
**Author:** ![ther](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@ther](https://www.ruby-forum.com/u/ther)\ **Post date:** [September 20, 2008, 12:45am UTC](https://www.ruby-forum.com/t/problem-installing-qt4-gem-on-windows/148920/4 "2008-09-20T00:45:59Z")
On Sep 19, 3:42 am, Damjan R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Package (x86) and now gem installs properly. I am on Vista. gem -v =\> > 1.2.0 > > I will submit a bug on ruby gems project. > > by > TheR You’re getting the building native extension issue since the gem specification file that defines the gem contains the reference to the extension extconf file. Gems that are supposed to be “native” for a specific platform should have their extensions definition emtpy. pure-ruby or the ones that requires building those, should contain the extconf, makefile or other references for RubyGems to fire the proper process for them. On a side note, bundling nmake.exe is a direct violation of distributing licenses of Microsoft Visual Studio. Regards, ---
**Author:** ![ther](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/977dab/32.png) [@ther](https://www.ruby-forum.com/u/ther)\ **Post date:** [September 19, 2008, 9:00am UTC](https://www.ruby-forum.com/t/problem-installing-qt4-gem-on-windows/148920/5 "2008-09-19T09:00:12Z")
So, it works 🙂 It’s needed cause, i compiled Qt 4.4.1 and qtruby with Visual Studio 2008. Damjan R. schrieb: > – Otto Software Partner GmbH Jan P. (e-mail: removed\_email\_address@domain.invalid) Tel. 0351/49723202, Fax: 0351/49723119 01067 Dresden, Freiberger Straße 35 - AG Dresden, HRB 2475 Geschäftsführer: Burkhard Arrenberg, Heinz A. Bade, Jens Gruhl