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我试图在Windows 8上安装curb gem，但它返回错误。我也在尝试提供诸如--with-curl-dir，--with-curl-lib，--with-curl-include之类的选项，但不起作用。每次它返回错误。请给出任何建议。由于无法在Windows 8上安装Ruby gem curb
C:\Users>gem install curb -- --with-curl-lib=C:/curl-7.21.0-devel-mingw32/bin --with-curl-include=C:/curl-7.21.0-devel-mingw32/include
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing curb:
ERROR: Failed to build gem native extension.
C:/Ruby193/bin/ruby.exe extconf.rb --with-curl-lib=C:/curl-7.21.0-devel-mingw32/bin --with-curl-include=C:/curl-7.21.0-devel-mingw32/include
checking for curl-config... no
checking for main() in -lcurl... no
*** 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:/Ruby193/bin/ruby
--with-curl-dir
--without-curl-dir
--with-curl-include=${curl-dir}/include
--with-curl-lib=${curl-dir}/lib
--with-curllib
--without-curllib
extconf.rb:23:in `<main>': Can't find libcurl or curl/curl.h (RuntimeError)
Try passing --with-curl-dir or --with-curl-lib and --with-curl-include
options to extconf.
Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/curb-0.8.6 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/curb-0.8.6/ext/gem_make.out