Issue while installing birch

[SauronTheGreat]

Hi,
I am having trouble when building a docker container. I have a rails app and in the docker file, I use
FROM rails:onbuild.
But when I build the container, I get the following error:

`Installing birch 0.0.8 with native extensions

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

current directory: /usr/local/bundle/gems/birch-0.0.8/ext/birch

/usr/local/bin/ruby -r ./siteconf20160204-7-z7y8lb.rb extconf.rb
creating Makefile

current directory: /usr/local/bundle/gems/birch-0.0.8/ext/birch
make "DESTDIR=" clean

current directory: /usr/local/bundle/gems/birch-0.0.8/ext/birch
make "DESTDIR="
compiling native.c
native.c: In function 'birch_edge_initialize':
native.c:42:8: warning: unused variable 'direction' [-Wunused-variable]
VALUE direction;
^
native.c:41:8: warning: unused variable 'directed' [-Wunused-variable]
VALUE directed;
^
native.c:40:8: warning: unused variable 'node_b' [-Wunused-variable]
VALUE node_b;
^
native.c:39:8: warning: unused variable 'node_a' [-Wunused-variable]
VALUE node_a;
^
native.c: In function 'birch_has_features':
native.c:272:3: warning: implicit declaration of function 'RHASH' [-Wimplicit-function-declaration]
if (!RHASH(features)->ntbl) {
^
native.c:272:23: error: invalid type argument of '->' (have 'int')
if (!RHASH(features)->ntbl) {
^
native.c: In function 'birch_edge_initialize':
native.c:58:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
native.c: In function 'birch_has_features':
native.c:275:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
Makefile:237: recipe for target 'native.o' failed
make: *** [native.o] Error 1

make failed, exit code 2

Gem files will remain installed in /usr/local/bundle/gems/birch-0.0.8 for inspection.
Results logged to /usr/local/bundle/extensions/x86_64-linux/2.2.0-static/birch-0.0.8/gem_make.out
`

I was able to solve is by using the contents of the dockerfile and changing ruby from 2.2 to 2.1.5

I understand its not your issue but informing you so it can help !

[tianon]

Given that the recommended usage for Rails itself is to add it to your project's Gemfile and use bundle to install it, the rails official image has been deprecated as of Jul 5 in favor of using the ruby image directly (see docker-library/docs#503 for more details).

Sorry for the inconvenience! Since the image will not be receiving anything besides minor maintenance updates (version bumps for example), we're closing out old issues accordingly. Thanks!