[DRE-maint] Bug#976493: ruby-psych: FTBFS: NameError: undefined method `default_specifications_dir' for class `#<Class:0x1cfd1875>'

[Lucas Nussbaum]

Source: ruby-psych
Version: 3.1.0+really3.1.0-1
Severity: serious
Justification: FTBFS on arm64
Tags: bullseye sid ftbfs
Usertags: ftbfs-20201205 ftbfs-bullseye

Hi,

During a rebuild of all packages in sid, your package failed to build
on arm64 (I don't know if it also fails on amd64).

Relevant part (hopefully):
> make[1]: Entering directory '/<<PKGBUILDDIR>>'
> JRUBY_HOME=/usr/share/jruby jruby -S rake compile
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by jnr.posix.JavaLibCHelper$ReflectiveAccess to method sun.nio.ch.SelChImpl.getFD()
> WARNING: Please consider reporting this to the maintainers of jnr.posix.JavaLibCHelper$ReflectiveAccess
> WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> NameError: undefined method `default_specifications_dir' for class `#<Class:0x1cfd1875>'
>   singleton class at /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:84
>            <main> at /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:58
>           require at org/jruby/RubyKernel.java:956
>            <main> at /usr/share/jruby/lib/ruby/stdlib/rubygems.rb:1
>           require at org/jruby/RubyKernel.java:956
>            <main> at /usr/share/jruby/lib/ruby/stdlib/rubygems.rb:1347
>              load at org/jruby/RubyKernel.java:974
>            <main> at uri:classloader:/jruby/kernel/gem_prelude.rb:1
> make[1]: *** [debian/rules:12: override_dh_auto_build-indep] Error 1

The full build log is available from:
   http://qa-logs.debian.net/2020/12/05/ruby-psych_3.1.0+really3.1.0-1_unstable.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

If you reassign this bug to another package, please marking it as 'affects'-ing
this package. See https://www.debian.org/Bugs/server-control#affects

If you fail to reproduce this, please provide a build log and diff it with me
so that we can identify if something relevant changed in the meantime.

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.