Dear Maintainer,
Please add --disable-video-rpi to ./configure in order to disable the usage of the old and unmaintained Raspberry Pi driver. KMS is now the prefered driver for the Pi, and while this option might seem correct, it uses the old kernel driver which conflicts with KMS/DRM.
I've compiled libsdl2 using the sources from bookwork, and compiles cleanly and the resulting library works as far as my testing goes.
The lastest Raspberry Pi OS use bullseye, and the old Raspberry Pi SDL driver is incompatible with it.

We believe that the bug you reported is fixed in the latest version of
libsdl2, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1012863@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Simon McVittie <smcv@debian.org> (supplier of updated libsdl2 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Fri, 17 Jun 2022 10:14:50 +0100
Source: libsdl2
Architecture: source
Version: 2.0.22+dfsg-6
Distribution: unstable
Urgency: medium
Maintainer: Debian SDL packages maintainers <pkg-sdl-maintainers@lists.alioth.debian.org>
Changed-By: Simon McVittie <smcv@debian.org>
Closes: 1012863
Changes:
 libsdl2 (2.0.22+dfsg-6) unstable; urgency=medium
 .
   * d/watch: Use GitHub to download releases
   * d/rules: Wrap configure flags one per line, and sort them.
     This reduces the diff when we change them.
   * d/rules: Explicitly disable use of libraries we don't build-depend on.
     SDL doesn't build-depend on JACK or the proprietary bcm_host and Vivante
     graphics APIs, so these would not get enabled in official Debian builds.
     For reproducibility, if they happen to be installed on a system where a
     contributor is doing their own local build, don't enable them
     there either.
     - In particular, this ensures that the old bcm_host driver for
       Raspberry Pi is not enabled. This is an outdated kernel driver which
       has been superseded by KMS/DRM. (Closes: #1012863)
   * d/rules: Explicitly disable auto-detection of other OSs' drivers.
     This ensures that they are not enabled if compatible headers are
     somehow available locally. Note that --disable-xinput refers to Windows
     XInput (an API for Xbox-360-compatible game controllers) and should not
     be confused with --enable-video-x11-xinput.
   * d/rules: Explicitly enable library dependencies we intend to enable
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Checksums-Sha256:
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 bf3b0aa072dea1bd332494225814b5f8 43220 libs optional libsdl2_2.0.22+dfsg-6.debian.tar.xz
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