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Editorial Team
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Asked: 2026-06-04T07:09:28+00:00

Over the last week, on a few gem install or gem update operations, I’ve

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Over the last week, on a few gem install or gem update operations, I’ve received an error similar to these:

ERROR:  While generating documentation for sinatra-1.3.1 ... MESSAGE:   error generating C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/doc/sinatra-1.3.1/rdoc/README_de_rdoc.html: incompatible encoding regexp match (UTF-8 regexp with IBM437 string) (Encoding::CompatibilityError)

similarly:

ERROR:  While generating documentation for rest-client-1.6.7 ... MESSAGE:   error generating C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/doc/rest-client-1.6.7/rdoc/README_rdoc.html: incompatible encoding regexp match (UTF-8 regexp with IBM437 string) (Encoding::CompatibilityError)

and possibly one other place. I’ve read up on this but don’t find a solution for code I did not write and data I don’t control. Any idea how to fix this?

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1 Answer

  1. Editorial Team

    michael.rp almost had it, but no quotes on the environment string for Windows. The same solution for Linux appears in the link supplied by jerry. For Windows:

    set RDOCOPT=--encoding=UTF-8

    I put this in the RubyInstaller\Ruby1.9.3\setup_environment.bat file so it is always there.

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