gemでpi_piperをインストールしようとしたが、下記のようなエラーが出てインストールできない.
pi@raspberrypi:~$ sudo gem install pi_piper
Building native extensions. This could take a while...
ERROR: Error installing pi_piper:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from extconf.rb:4:in `<main>'
Gem files will remain installed in /var/lib/gems/1.9.1/gems/ffi-1.9.3 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/ffi-1.9.3/ext/ffi_c/gem_make.out
pi@raspberrypi:~$
どうやらpi_piperを入れるには ruby_ffi というパッケージが必要らしい. apt-getでインストール.
pi@raspberrypi:~$ sudo apt-get install ruby-ffi
...省略...
自動でgemに登録されないので、手動で登録. 以下はrubyのバージョンが1.9.1の場合の例.
pi@raspberrypi:~$ cd /var/lib/gems/1.9.1/specifications/
pi@raspberrypi:~$ sudo ln -s /usr/share/rubygems-integration/1.9.1/specifications/ffi-1.0.11.gemspec .
gem listで正しく登録できているか確認できます.
pi@raspberrypi:/var/lib/gems/1.9.1/specifications$ gem list
*** LOCAL GEMS ***
ffi (1.0.11)
pi@raspberrypi:/var/lib/gems/1.9.1/specifications$
再度gemでpi_piperをインストール.
pi@raspberrypi:~$ sudo gem install pi_piper
Fetching: pi_piper-1.3.2.gem (100%)
Successfully installed pi_piper-1.3.2
1 gem installed
Installing ri documentation for pi_piper-1.3.2...
unable to convert "\x80" from ASCII-8BIT to UTF-8 for lib/pi_piper/libbcm2835.img, skipping
Installing RDoc documentation for pi_piper-1.3.2...
unable to convert "\x80" from ASCII-8BIT to UTF-8 for lib/pi_piper/libbcm2835.img, skipping
pi@raspberrypi:~$
成功しました！
