... so that sagelib is just an ordinary script package whose source tree is included (hence, no checksums.ini file; see #29287).

Related sage-devel discussions:

• https://groups.google.com/d/msg/sage-devel/nTwhCV89FXE/_7GdzGy4BgAJ ("package sources")
• https://groups.google.com/d/msg/sage-devel/nTwhCV89FXE/-obd4rMDBAAJ

Related tickets:

• Install script and pip packages via sage-spkg #29386 Install script packages via sage-spkg

Depends on #29098
Depends on #29697
Depends on #29793

CC: @embray @videlec @orlitzky @dimpase @jhpalmieri @kiwifb

Component: build

Author: Matthias Koeppe

Branch: cc30471

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/29411