.gem/ruby/2.4.0/gems/eventmachine-1.2.5/ext
/nix/store/xmphgh0ga044aw1anfj3wr4yvsl6gk43-ruby-2.4.3/bin/ruby -r ./siteconf20180423-20481-t9z37j.rb extconf.rb
checking for -lcrypto... *** 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=/nix/store/xmphgh0ga044aw1anfj3wr4yvsl6gk43-ruby-2.4.3/bin/$(RUBY_BASE_NAME)
        --with-ssl-dir
        --without-ssl-dir
        --with-ssl-include
        --without-ssl-include=${ssl-dir}/include
        --with-ssl-lib
        --without-ssl-lib=${ssl-dir}/lib
        --with-openssl-config
        --without-openssl-config
        --with-pkg-config
        --without-pkg-config
        --with-cryptolib
        --without-cryptolib
/nix/store/xmphgh0ga044aw1anfj3wr4yvsl6gk43-ruby-2.4.3/lib/ruby/2.4.0/mkmf.rb:457:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.