Installing curb on ruby1.8.6

Question

I cannot install curb on Windows 7 x64 with ruby1.8.6 p111:

ruby extconf.rb install curb-0.8.1.gem -- --with-curl-dir=C:\curl-7.26.0
checking for curl-config... no
checking for main() in curl.lib... 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
    --srcdir=.
    --curdir
    --ruby=C:/Ruby186/bin/ruby
    --with-curl-dir
    --with-curl-include
    --without-curl-include=${curl-dir}/include
    --with-curl-lib
    --without-curl-lib=${curl-dir}/lib
    --with-curllib
    --without-curllib
extconf.rb:18:   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.

For clarification, C:\curl-7.26.0 is a libcurl v7.26.0 with lib/bin/include folders.

What am I missing?

Answer 1

The same answer I provided here applies to your issue:

https://stackoverflow.com/a/11484346/117298

But I highly recommend you upgrade at least to Ruby 1.8.7, considering 1.8.6 is no longer maintained and 1.8.7 End-Of-Life has been announced already.