output.txt

C:> gem install iconv -v '1.0.5' --source 'http://rubygems.org/'
Building native extensions.  This could take a while...
ERROR:  Error installing iconv:
        ERROR: Failed to build gem native extension.

    current directory: C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/iconv-1.0.5/ext/iconv
C:/RailsInstaller/Ruby2.3.0/bin/ruby.exe -r ./siteconf20180627-17512-2e86tn.rb extconf.rb
checking for rb_enc_get() in ruby/encoding.h... yes
checking for rb_sys_fail_str() in ruby.h... yes
checking for iconv() in iconv.h... no
checking for iconv() in -liconv... 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:/RailsInstaller/Ruby2.3.0/bin/$(RUBY_BASE_NAME)
        --with-iconv-dir
        --without-iconv-dir
        --with-iconv-include
        --without-iconv-include=${iconv-dir}/include
        --with-iconv-lib
        --without-iconv-lib=${iconv-dir}/lib
        --enable-config-charset
        --disable-config-charset
        --with-config-charset