On Thu, 02 Jan 2025 at 18:45:41 +0000, Simon McVittie wrote:

Control: reassign -1 libwlroots-0.18-dev 0.18.2-1
Control: retitle -1 libwlroots-0.18-dev: missing dependency on liblcms2-dev

Sorry, I forgot to cc the wlroots maintainers when reassigning. Quoting
full text below.

On Thu, 02 Jan 2025 at 18:09:04 +0000, Santiago Vila wrote:

During a rebuild of all packages in unstable, [gamescope] failed to build:

Note: The following packages fail in a similar way:
cage gamescope phoc reform-firedecor sway wayfire wayfire-shadows wcm wf-shell wstroke

...

-----------
Called: `/usr/bin/pkg-config --cflags wlroots-0.18` -> 1
stderr:
Package lcms2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lcms2.pc'
to the PKG_CONFIG_PATH environment variable
Package 'lcms2', required by 'wlroots-0.18', not found

I think this is a wlroots packaging issue. It is also visible as
an autopkgtest regression for at least reform-firedecor on wlroots' tracker.debian.org page.

* Steps to reproduce

(In a minimal chroot or container, I used debian:sid-slim)
apt update
apt install --no-install-recommends libwlroots-0.18-dev
pkgconf --cflags --libs wlroots-0.18

* Expected result

-I/usr/include/wlroots-0.18 -I/usr/include/libdrm -I/usr/include/pixman-1 -pthread -lwlroots-0.18
(or something similar)

* Actual result

Package lcms2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lcms2.pc'
to the PKG_CONFIG_PATH environment variable
Package 'lcms2', required by 'wlroots-0.18', not found

* Suggested solution

Add Depends: liblcms2-dev to libwlroots-0.18-dev

Adding a superficial autopkgtest similar to the one I contributed in https://bugs.debian.org/1088243, and running it in a minimal chroot/container/VM before each upload, can be a surprisingly effective
way to avoid bugs in this category happening in future.

smcv

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