rake aborted!
cannot load such file -- iconv
D:/projects/diasparkrwWEB5/config/application.rb:7:in `<top (required)>'
D:/projects/diasparkrwWEB5/Rakefile:11:in `<top (required)>'
(See full trace by running task with --trace)

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:
C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/iconv-1.0.4/ext/iconv
C:/Ruby23-x64/bin/ruby.exe -r ./siteconf20170726-12440-1nqxt6e.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.