I have been having this problem on windows 7 where I have installed
JRuby, sometimes when I try to install a regular Ruby gem instead of
something for JRuby I get an error message that seems to indicate it
thinks it's for JRuby ..
Below is an example. If I was going to install the gem to JRuby I
would type
jruby -S gem install watir --no-ri --no-rdoc, but I tried to install
it to the other Ruby:
gem install watir --no-ri --no-rdoc
C:\Users\lguild\Downloads\devkit>gem install watir --no-ri --no-rdoc
Building native extensions. This could take a while...
ERROR: Error installing watir:
ERROR: Failed to build gem native extension.
c:/jruby-1.6.7/bin/jruby.exe extconf.rb
WARNING: JRuby does not support native extensions or the `mkmf'
library very wel
l.
Check http://kenai.com/projects/jruby/pages/Home for alternatives.
checking for strncpy_s()... IOError: Cannot run program "cc" (in
directory "C:\j
ruby-1.6.7\lib\ruby\gems\1.8\gems\win32-api-1.4.8\ext"): CreateProcess
error=2,
The system cannot find the file specified
popen at org/jruby/RubyIO.java:3613
xpopen at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:323
open at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:260
xpopen at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:316
egrep_cpp at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:538
have_func at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:758
checking_for at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:652
postpone at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:286
open at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:260
postpone at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:286
open at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:260
postpone at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:282
checking_for at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:651
have_func at c:/jruby-1.6.7/lib/ruby/site_ruby/shared/mkmf.rb:755
(root) at extconf.rb:9
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=c:/jruby-1.6.7/bin/jruby
Gem files will remain installed in c:/jruby-1.6.7/lib/ruby/gems/1.8/
gems/win32-a
pi-1.4.8 for inspection.
Results logged to c:/jruby-1.6.7/lib/ruby/gems/1.8/gems/win32-
api-1.4.8/ext/gem_
make.out
C:\Users\lguild\Downloads\devkit>
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