Failed to install charlock_holmes on Windows 8 due to missing zlib - ruby

Question

I'm trying to install charlock_holmes on Windows 8, but I can't point it to a valid zlib binary. I tried vaiours dll's from Cygwin and from zlib.net, with no luck. The question is, how to link to zlib properly?
gem install charlock_holmes -- --with-icu-dir=D:\download\icu4c-4_0_1-Win64-msvc8\usr\local --with-icui18nlib=icuin --with-icudatalib=icudt --with-zlib=WHATHEVER_WONT_WORK
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing charlock_holmes:
ERROR: Failed to build gem native extension.
d:/bin/Ruby193/bin/ruby.exe extconf.rb --with-icu-dir=D:\download\icu4c-4_0_1-Win64-msvc8\usr\local --with-icui18nlib=icuin --with-icudatalib=icudt --with- zlib=WHATHEVER_WONT_WORK
checking for main() in -licuin... yes
checking for main() in -licuin... yes
checking for unicode/ucnv.h... yes
checking for main() in -lWHATHEVER_WONT_WORK... no
libz missing
*** 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=d:/bin/Ruby193/bin/ruby
--with-icu-dir
--with-icu-include
--without-icu-include=${icu-dir}/include
--with-icu-lib
--without-icu-lib=${icu-dir}/lib
--with-icui18nlib
--with-icui18nlib
--with-zlib
Gem files will remain installed in d:/bin/Ruby193/lib/ruby/gems/1.9.1/gems/charlock_holmes-0.7.3 for inspection.
Results logged to d:/bin/Ruby193/lib/ruby/gems/1.9.1/gems/charlock_holmes-0.7.3/ext/charlock_holmes/gem_make.out

Answer 1

libz.a goes to [devkit-dir]/mingw/lib, not [devkit-dir]/lib. Problem solved.