[2013-02-06 14:19:04] rvm gemset pristine # under ruby-1.9.3-p374
Restoring gems to pristine condition...
bigdecimal-1.1.0 ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format
io-console-0.3 ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format
json-1.5.4 ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format
minitest-2.5.1 ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format
rake-0.9.2.2 ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format
rdoc-3.9.4 ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format

'gem pristine bigdecimal --version 1.1.0 io-console --version 0.3 json --version 1.5.4 minitest --version 2.5.1 rake --version 0.9.2.2 rdoc --version 3.9.4' failed, you need to fix this gems manually.
[2013-02-06 14:19:15] rvm gemset pristine # under ruby-1.9.3-p374@global
Restoring gems to pristine condition...

finished.
[2013-02-06 14:31:41] rvm gemset pristine # under ruby-1.9.3-p374
Restoring gems to pristine condition...
bigdecimal-1.1.0 ERROR:  Loading command: pristine (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::PristineCommand
io-console-0.3 ERROR:  Loading command: pristine (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::PristineCommand
json-1.5.4 ERROR:  Loading command: pristine (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::PristineCommand
minitest-2.5.1 ERROR:  Loading command: pristine (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::PristineCommand
rake-0.9.2.2 ERROR:  Loading command: pristine (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::PristineCommand
rdoc-3.9.4 ERROR:  Loading command: pristine (LoadError)
    cannot load such file -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::PristineCommand

'gem pristine bigdecimal --version 1.1.0 io-console --version 0.3 json --version 1.5.4 minitest --version 2.5.1 rake --version 0.9.2.2 rdoc --version 3.9.4' failed, you need to fix this gems manually.
[2013-02-06 14:31:42] rvm gemset pristine # under ruby-1.9.3-p374@global
Restoring gems to pristine condition...

finished.