Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

[mhaberler]

Hi Marc,

very useful container! not yet for me though.. unfortunately the build fails here:

Installing minitest 5.8.4
Installing thread_safe 0.3.5
Installing addressable 2.4.0
Installing afm 0.2.2
Installing asciidoctor 1.5.4
Installing rjb 1.4.9 with native extensions

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/gems/2.3.0/gems/rjb-1.4.9/ext
/usr/local/rvm/rubies/ruby-2.3.0/bin/ruby -r ./siteconf20160504-7-1mol5ia.rb extconf.rb
*** 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/rvm/rubies/ruby-2.3.0/bin/$(RUBY_BASE_NAME)
extconf.rb:53:in `<main>': JAVA_HOME is not set. (RuntimeError)

extconf failed, exit code 1
....
Installing temple 0.7.6
Using bundler 1.12.1
Installing tzinfo 1.2.2
Installing memoizable 0.4.2
Installing css_parser 1.4.1
Using jekyll-asciidoc 1.0.2.dev from https://github.com/asciidoctor/jekyll-asciidoc.git (at master@548426f)
An error occurred while installing rjb (1.4.9), and Bundler cannot continue.
Make sure that `gem install rjb -v '1.4.9'` succeeds before bundling.
The command '/bin/sh -c cd /root/ && bundle install' returned a non-zero code: 5

not sure how to proceed - JAVA_HOME unset?

this is the part of the build log which I could salvage: http://hastebin.com/pumemafiwu.vhdl
second run: http://hastebin.com/igusoyotum.coffee

$ docker version
Client:
 Version:      1.11.1
 API version:  1.23
 Go version:   go1.5.4
 Git commit:   5604cbe
 Built:        Tue Apr 26 23:11:07 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.11.1
 API version:  1.23
 Go version:   go1.5.4
 Git commit:   5604cbe
 Built:        Tue Apr 26 23:11:07 2016
 OS/Arch:      linux/amd64