ubuntu で gem install do_postgres に失敗した
$ gem install do_postgres
したら以下のようにエラーになった。
Building native extensions. This could take a while... ERROR: Error installing do_postgres: ERROR: Failed to build gem native extension. /usr/bin/ruby2.1 -r ./siteconf20150308-31837-a4mid6.rb extconf.rb checking for main() in -lpq... yes checking for libpq-fe.h... yes checking for libpq/libpq-fs.h... yes checking for postgres.h... 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=/usr/bin/ruby2.1 --with-pgsql-server-dir --without-pgsql-server-dir --with-pgsql-server-include --without-pgsql-server-include=${pgsql-server-dir}/include --with-pgsql-server-lib --without-pgsql-server-lib=${pgsql-server-dir}/lib --with-pgsql-client-dir --without-pgsql-client-dir --with-pgsql-client-include --without-pgsql-client-include=${pgsql-client-dir}/include --with-pgsql-client-lib --without-pgsql-client-lib=${pgsql-client-dir}/lib --with-pqlib --without-pqlib Could not find PostgreSQL build environment (libraries & headers): Makefile not created extconf failed, exit code 1 Gem files will remain installed in /var/lib/gems/2.1.0/gems/do_postgres-0.10.15 for inspection. Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/do_postgres-0.10.15/gem_make.out
予め以下のものを入れておく必要があるみたい。
$ sudo apt-get install postgresql-9.3 postgresql-server-dev-9.3 libpq-dev
これでおっけー。