The generated header's path now depends on in-tree vs relocated builds
(database/database.h vs include/database/database.h), so instructions
that named it directly ("make database/database.h") are brittle.
Add a stable, path-independent top-level target:
.PHONY: prepare
prepare: ${DATABASE_H}
Being .PHONY the name is always valid, but its prerequisite is the real
file target ${DATABASE_H}, so the header is still regenerated only when
out of date -- same result, no exposed path.
Convert every "make database/database.h" in the docs, appimage
Dockerfiles, and CI workflows to "make prepare".
Verified: relocated `make prepare` generates include/database/database.h;
re-running is a no-op; touching database.h.in triggers regeneration.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Removes ubuntu-20.04 config (no longer available on GitHub CI)
added clang-19 and gcc-13
removed no_gc_gu, as all 'gl' (GL) options require 'gu' (GLU)
added build for --enable-readline-bundled
added X11+Cairo
Darryl L. Miles