如何用rbenv/ruby-build在Raspberry Pi上构建JRuby 1.7.13？

Question

我正在尝试将JRuby (最好是1.7.13版本)安装到Raspberry Pi上。我已经安装了rbenv/ruby构建。当我试图安装JRuby ( 1.7.13或1.7.11)时，会出现以下错误：

pi@raspberrypi:~$ rbenv install jruby-1.7.13
Downloading jruby-bin-1.7.13.tar.gz...
-> http://dqw8nmjcqpjn7.cloudfront.net/faa1cd590f32f3cb92044d9abedf66ccea1d93a24236c877810c9b30e1e0577c
Installing jruby-1.7.13...

BUILD FAILED

Inspect or clean up the working tree at /tmp/ruby-build.20140713094726.2669
Results logged to /tmp/ruby-build.20140713094726.2669.log

Last 10 log lines:
jruby-1.7.13/tool/nailgun/Makefile.in
jruby-1.7.13/tool/nailgun/ng.exe
jruby-1.7.13/tool/nailgun/README.txt
jruby-1.7.13/tool/nailgun/src/c/ng.c
/tmp/ruby-build.20140713094726.2669/jruby-1.7.13 /tmp/ruby-build.20140713094726.2669 ~
ERROR:  Loading command: install (LoadError)
    Could not load FFI Provider: (NotImplementedError) FFI not available: null
 See http://jira.codehaus.org/browse/JRUBY-4583
ERROR:  While executing gem ... (NoMethodError)
    undefined method `invoke_with_build_args' for nil:NilClass

是否有可能在ARM上为Linux构建JFFI，我应该怎么做呢？

Answer 1

我相信答案是在Raspberry Pi上编译JFFI，并将生成的libjffi-1.2.so复制到/usr/lib。当我现在尝试使用rbenv安装JRuby 1.7.13时，我不再得到丢失的FFI错误，而是“无法分配内存”错误。

我编译libjffi的过程是；

cd ~
pi@raspberrypi:~$ git clone git://github.com/jnr/jffi.git jffi.git
cd jffi.git
ant jar
sudo cp libjffi-1.2.so /usr/lib