When I'm trying to install mono, this happens:
```plaintext
$ guix install mono
The following package will be installed:
mono 6.12.0.206
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...
100.0%
The following derivations will be built:
/gnu/store/9zs7qc97876snnks94r6qb7z4i1g9qys-mono-2.4.2.3.drv
/gnu/store/v15k2ya47x728a8yg21j6airbfgb1530-mono-2.6.4.drv
/gnu/store/6xdd326j0k3rdsmy6r3mxkzysyysxz0k-mono-2.11.4.drv
/gnu/store/bspnf3bnq7ys52v6i448pbwgdarcg0pr-mono-3.0.12.drv
/gnu/store/k0i7rbgap2nysd302k5x8vpvcajx9pri-mono-3.12.1.drv
/gnu/store/jlm50hlg4pl1q5sr1rnzidrvvyh3ms0w-mono-4.9.0.drv
/gnu/store/8mn64i3ssghrj2bj389wki5yi5ps5hk6-mono-5.0.1.drv
/gnu/store/2zd9p91hhmlyszljhpwf8d5flyrlq7i3-mono-5.1.0.drv
/gnu/store/qz5yw0z2n6q370ccy1sy2v1zh34mg69k-mono-5.2.0.224.drv
/gnu/store/j2l6pyg87qw0h13d0bwvchvr2v0wpnpf-mono-5.4.0.212.drv
/gnu/store/dgdz9z07lp0d5b2kw9h5i52q8y371jjp-mono-5.4.0.201-0.d0f51b4.drv
/gnu/store/8nv7n01wdn85ck8k9p15zdw3p515lam2-mono-5.8.0.129.drv
/gnu/store/l1x8yp7fniwpnirbvv0948m2wrvvcfng-mono-5.8.0.129-0.3e9d7d6.drv
/gnu/store/c8i4b2rykj58gxwdcklmg3bqfjaw48bj-mono-5.10.0.179.drv
/gnu/store/ckmk0d9q2fidfd104j7lnwx6jfpyw3sa-mono-6.12.0.206.drv
building /gnu/store/9zs7qc97876snnks94r6qb7z4i1g9qys-mono-2.4.2.3.drv...
```
So when trying to build mono 6.12.0.206 it want's to build all those
other versions first. Is this due to how mono is designed, or do we have
an issue with dependencies in guix?
Mono isn't small, it takes a while to compile, so this takes up quite
some resources.
There doesn't seem to be substitutes for those packages yet, so I'm
going to wait before installing those. Otherwise this will compile on my
system for a few hours I'm afraid.
Cheers
nomike
