## merb install
# gem install merb
Building native extensions.  This could take a while...
ERROR:  Error installing merb:
        ERROR: Failed to build gem native extension.

/usr/local/bin/ruby18 extconf.rb install merb
checking for sqlite3.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.

## sqlite3.h ??
# locate sqlite3.h
/usr/local/include/php/ext/pdo_sqlite/sqlite/src/sqlite3.h
/usr/local/include/sqlite3.h
/usr/local/lib/ruby/gems/1.8/doc/dm-migrations-0.9.5/rdoc/classes/SQL/Sqlite3.html
/usr/local/lib/ruby/gems/1.8/doc/sqlite3-ruby-1.2.1/rdoc/classes/SQLite3.html
/usr/local/lib/ruby/gems/1.8/doc/sqlite3-ruby-1.2.2/rdoc/classes/SQLite3.html
/usr/local/lib/ruby/gems/1.8/doc/sqlite3-ruby-1.2.4/rdoc/classes/SQLite3.html