■

よくあるのでメモです。

【fcgiインストール失敗】
Building native extensions. This could take a while...
ERROR: Error installing fcgi:
ERROR: Failed to build gem native extension.

/usr/local/bin/ruby18 extconf.rb
checking for fcgiapp.h... no
checking for fastcgi/fcgiapp.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/local/bin/ruby18
--with-fcgi-dir
--without-fcgi-dir
--with-fcgi-include
--without-fcgi-include=${fcgi-dir}/include
--with-fcgi-lib
--without-fcgi-lib=${fcgi-dir}/lib

【検索】
find / -name 'fcgiapp.h'
/usr/local/include/fcgiapp.h

【オプション設定】
gem install fcgi -- --with-fcgi-include=/usr/local/include