Jekyll Gemfile issue with wdm package: Building website on Windows

When make site is run, an error occurs:

bundle install; bundle exec jekyll serve --drafts --incremental --livereload
Could not find command "install;".
make: *** [Makefile:6: site] Error 15

tried running bundle install error occurs:

An error occurred while installing wdm (0.1.1), and Bundler cannot continue.

In Gemfile:

if this error occurs, you just need to add an additional flag and run the command:
gem install wdm:0.1.1 -- --with-cflags=-Wno-implicit-function-declaration

then run:
bundle install

and then finally run:
bundle exec jekyll serve --drafts --incremental --livereload

This should resolve the issue.