Looks like I can reproduce the issue with -s i686-linux. I tried to build using Ruby 2.7 (we use 2.6 by default, and tests pass)

You can test with: --with-input=ruby@2.6=ruby@2.7

I'm not a Ruby user, so I won't risk sending a patch. Probably, since it's used only by rubocop as a native input, we can safely use a differert ruby package for this?

Le 4 mars 2021 20:46:52 GMT-05:00, Christopher Howard <christopher@librehacker.com> a écrit :
I'm trying to install mate desktop on a 32 bit x86 laptop. This evidently is dependent on gnome-shell building, which in turn is dependent on ruby-memory-profiler, which does not build due to three test failures.

"""
   /gnu/store/v3zgvwa1c0w44skld09iminwrg5j93c9-ruby-memory-profiler-1.0.0.drv

building /gnu/store/v3zgvwa1c0w44skld09iminwrg5j93c9-ruby-memory-profiler-1.0.0.drv...
builder for `/gnu/store/v3zgvwa1c0w44skld09iminwrg5j93c9-ruby-memory-profiler-1.0.0.drv' failed with exit code 1
build of /gnu/store/v3zgvwa1c0w44skld09iminwrg5j93c9-ruby-memory-profiler-1.0.0.drv failed
View build log at '/var/log/guix/drvs/v3/zgvwa1c0w44skld09iminwrg5j93c9-ruby-memory-profiler-1.0.0.drv.bz2'.
cannot build derivation `/gnu/store/q8l4d3qxz8vghv5i526zckqa31xrx11n-ruby-rubocop-1.10.0.drv': 1 dependencies couldn't be built
building /gnu/store/vynlki5k7r2y3950xdihxr3cdi9rn47p-ruby-rubocop-ast-1.4.1-checkout.drv...
cannot build derivation `/gnu/store/2yy6q52ximcm8zxyw9xdpiayc7b0mnlx-ruby-rdoc-6.2.0.drv': 1 dependencies couldn't be built
cannot build derivation `/gnu/store/jxg83183dmms1w5id7kqbi1alvpyyf64-ruby-terminfo-0.1.1.drv': 1 dependencies couldn't be built
cannot build derivation `/gnu/store/nsq3ydsz5rpqjg2qbpq2zggmxvxf3xbg-ruby-sass-3.6.0.drv': 1 dependencies couldn't be built
cannot build derivation `/gnu/store/k25lm8nxsiba262y92ps802n79f8x5dz-gnome-shell-3.34.2.drv': 1 dependencies couldn't be built
guix system: error: build of `/gnu/store/k25lm8nxsiba262y92ps802n79f8x5dz-gnome-shell-3.34.2.drv' failed
"""

My system info:
"""
$ neofetch --stdout
root@mithril 
------------ 
OS: Guix System 1.2.0-8.7624ebb i686 
Host: CF-30CTQAZBM 001 
Kernel: 5.10.2-gnu 
Uptime: 2 hours, 43 mins 
Packages: 66 (guix-system) 
Shell: bash 5.0.16 
Resolution: 1024x768 
Terminal: .emacs-27.1-rea 
CPU: Genuine Intel L2400 (2) @ 1.667GHz 
GPU: Intel Mobile 945GM/GMS/GME, 943/940GML Express 
Memory: 72MiB / 3013MiB

$ guix describe
Generation 2 Mar 04 2021 05:58:22 (current)
  guix bc10203
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: bc10203475ede3f88416a7614b7e9343fca8de75
"""

Build log attached.