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gem install pg -v '1.1.2'
Building native extensions. This could take a while... /home/ervincheung/.rvm/rubies/ruby-2.5.1/lib/ruby/site_ruby/2.5.0/rubygems/ext/builder.rb:76: warning: Insecure world writable dir /home/ervincheung/.rvm/gems/ruby-2.5.1/bin in PATH, mode 040777 ERROR: Error installing pg: ERROR: Failed to build gem native extension. current directory: /home/ervincheung/.rvm/gems/ruby-2.5.1/gems/pg-1.1.2/ext /home/ervincheung/.rvm/rubies/ruby-2.5.1/bin/ruby -r ./siteconf20190519-1515-1hdscwa.rb extconf.rb checking for pg_config... no No pg_config... trying anyway. If building fails, please try again with --with-pg-config=/path/to/pg_config checking for libpq-fe.h... no Can't find the 'libpq-fe.h header *** 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=/home/ervincheung/.rvm/rubies/ruby-2.5.1/bin/$(RUBY_BASE_NAME) --with-pg --without-pg --enable-windows-cross --disable-windows-cross --with-pg-config --without-pg-config --with-pg_config --without-pg_config --with-pg-dir --without-pg-dir --with-pg-include --without-pg-include=${pg-dir}/include --with-pg-lib --without-pg-lib=${pg-dir}/lib To see why this extension failed to compile, please check the mkmf.log which can be found here: /home/ervincheung/.rvm/gems/ruby-2.5.1/extensions/x86_64-linux/2.5.0/pg-1.1.2/mkmf.log extconf failed, exit code 1 Gem files will remain installed in /home/ervincheung/.rvm/gems/ruby-2.5.1/gems/pg-1.1.2 for inspection. Results logged to /home/ervincheung/.rvm/gems/ruby-2.5.1/extensions/x86_64-linux/2.5.0/pg-1.1.2/gem_make.out
只需要：
sudo apt-get install libpq-dev
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