ERROR: Error installing rails: ERROR: Failed to build gem native extension.

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1

hi-Im use cygwin and want to install rails (gem install rails) I have error please help me

$ gem install rails --version 4.2.1 Building native extensions. This could take a while... ERROR: Error installing rails:         ERROR: Failed to build gem native extension.

    /usr/bin/ruby.exe -r ./siteconf20150407-7680-1fo1fpe.rb extconf.rb checking if the C compiler accepts ... *** 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=/usr/bin/ruby         --help         --clean /usr/share/ruby/2.0.0/mkmf.rb:434:in `try_do': The compiler failed to generate a n executable file. (RuntimeError) You have to install development tools first.         from /usr/share/ruby/2.0.0/mkmf.rb:549:in `block in try_compile'         from /usr/share/ruby/2.0.0/mkmf.rb:500:in `with_werror'         from /usr/share/ruby/2.0.0/mkmf.rb:549:in `try_compile'         from extconf.rb:80:in `nokogiri_try_compile'         from extconf.rb:87:in `block in add_cflags'         from /usr/share/ruby/2.0.0/mkmf.rb:599:in `with_cflags'         from extconf.rb:86:in `add_cflags'         from extconf.rb:337:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /home/mohammad/.gem/ruby/gems/nokogiri-1.6.6. 2 for inspection. Results logged to /home/mohammad/.gem/ruby/extensions/x86_64-cygwin/nokogiri-1.6 .6.2/gem_make.out

2

hi-Im use cygwin and want to install rails (gem install rails)

I have error please help me

$ gem install rails --version 4.2.1

Building native extensions. This could take a while…

ERROR: Error installing rails:

    ERROR: Failed to build gem native extension.



/usr/bin/ruby.exe -r ./siteconf20150407-7680-1fo1fpe.rb extconf.rb

checking if the C compiler accepts … *** 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=/usr/bin/ruby

    --help

    --clean

/usr/share/ruby/2.0.0/mkmf.rb:434:in `try_do’: The compiler failed to

generate a

n executable file. (RuntimeError)

You have to install development tools first.

    from /usr/share/ruby/2.0.0/mkmf.rb:549:in `block in try_compile'

    from /usr/share/ruby/2.0.0/mkmf.rb:500:in `with_werror'

    from /usr/share/ruby/2.0.0/mkmf.rb:549:in `try_compile'

    from extconf.rb:80:in `nokogiri_try_compile'

    from extconf.rb:87:in `block in add_cflags'

    from /usr/share/ruby/2.0.0/mkmf.rb:599:in `with_cflags'

    from extconf.rb:86:in `add_cflags'

    from extconf.rb:337:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in

/home/mohammad/.gem/ruby/gems/nokogiri-1.6.6.

2 for inspection.

Results logged to

/home/mohammad/.gem/ruby/extensions/x86_64-cygwin/nokogiri-1.6

.6.2/gem_make.out

if you haven’t installed DevKit, so do that, it will solve the problem: