python.pkgs.pkgconfig raises an exception on missing packages since
version 1.5.0. Previously those errors were just silently ignored. That
worked fine, since the packages are only missing at runtime (when they
are not really needed) but present at buildtime.
Since this fails the tests now, we just add the packages to
PKG_CONFIG_PATH at runtime. This does not add additional runtime
dependencies. Still, it would be nicer if the sage testssuite would not
test the buildsystem at runtime in the first place.
The breakage was originally caused by the pkgconfig update in
1efa71616f.
cmp is deprecated since attrs 19.2.0:
http://www.attrs.org/en/19.2.0/changelog.html
The deprecation warning breaks the doctests. Fortunately they have a
rather long deprecation window, so we can just wait until upstream(s)
fix this.
elementary OS's ecosystem is curated around Ubuntu's LTS releases.
This means the development platform for their curated applications
always includes a LTS version of vala (in 18.04 it's 0.40).
Because of how vala development works it suspect some of these
applications to have serious issues if complied with the latest vala.
However in the past year or so, for Pantheon at least, I don't think
their applications will have much issues with latest vala, and if there
is I don't think they'd be difficult to fix. In this single regard they've
become more responsive since their preferred language is vala.
As for the curated applications I have less of this confidence in.
So I'd have to be accept less applications, but that's something
I'm willing to compromise on. And this is easily reversible or
could be done on a per-application basis. And nix already makes
this trivial.
Sage now by default expects the lcalc library to be named Lfunction
(instead of libLfunction). This could be changed by an environment
variable (https://trac.sagemath.org/ticket/28224), but various distros
seem to agree on this standard
(https://groups.google.com/forum/#!topic/sage-packaging/xvh55IxHTZg) so
it's best just to follow it. The old standard was set by sage anyway and
sage is the only consumer of lcalc in nixpkgs.
