** Description changed:

+ [Impact]
+ * People using the library to build custom applications
+ 
+ [Test Plan]
+ * try to build Simutrans-Extended app from github code
+ 
+ [Where problems could occur]
+ * Without some dependencies being installed (libdecor-0-dev libdrm-dev 
libgbm-dev libxfixes-dev), the build will fail
+ 
+ [ other info ]
  UBUNTU RELEASE
  
  Ubuntu 22.04 LTS (Kubuntu but I think that's irrelevant)
  
  PACKAGES AND VERSIONS
  libsdl2-dev 2.0.20+dfsg-2build1
  libsdl2-2.0-0 2.0.20+dfsg-2build1
  
  STEPS TO REPRODUCE
  
  (This is how I discovered the issue, but there is probably a much more 
minimal reproduction case)
  1. Download the Simutrans-Extended repo: 
https://github.com/jamespetts/simutrans-extended
  2. Download the dependencies, at a minimum libsdl2-dev
  3. Following the instructions there for building with autotools
  
  EXPECTED RESULTS
  
  Simutrans-Extended compiles correctly, as it did on Focal Fossa.
  
  ACTUAL RESULTS
  
  When I tried to build it on Jammy Jellyfish, the build failed with the
  following errors from the linker:
  
      /usr/bin/ld: cannot find -ldrm: No such file or directory
      /usr/bin/ld: cannot find -lgbm: No such file or directory
      /usr/bin/ld: cannot find -ldecor-0: No such file or directory
  
  Installing the libdrm-dev, libgbm-dev, and libdecor-0-dev packages
  solved that problem. But I wonder whether it might be a packaging bug. I
  follow Simutrans-Extended development quite closely and we have not
  intentionally introduced dependencies on those packages; I think they
  have been brought in by SDL2.
  
  If a program using sdl2-dev used to be able to compile without those
  packages, but now requires them, it seems to me that they are now
  dependencies of sdl2-dev. Or at least be 'suggests'. But I am not an
  expert on this.
  
  COMMENTS
  
  Those libraries are not direct dependencies of Simutrans. However,
  Ubuntu's sdl2-0-0 package has added dependencies on libgbm1, libdrm2,
  and libdecor-0-0.
  
  Compare the Focal dependencies.... 
https://packages.ubuntu.com/focal/libsdl2-2.0-0
  ......with the Jammy dependencies: 
https://packages.ubuntu.com/jammy/libsdl2-2.0-0
  
  The  Jammy libsdl2-dev package does **not** list dependencies on the
  appropriate development packages:
  https://packages.ubuntu.com/jammy/libsdl2-dev
  
  I notice that SDL's own build guide lists those packages as dependencies for 
building SDL2 itself on Focal Fossa: 
https://github.com/libsdl-org/SDL/blob/main/docs/README-linux.md
  But that change was made in February 2021 so it affects Ubuntu's version of 
SDL2 in Jammy, not Focal: 
https://github.com/libsdl-org/SDL/commit/2f4e9294aa260635d876b5699846adc458f555db
  
  I initially asked about this on AskUbuntu and a comment there confirmed
  that the required .so files are in (for example) libgbm-dev, not lib-
  gbm1: https://askubuntu.com/questions/1410876/is-ubuntus-libsdl2-dev-
  package-missing-dependencies-or-have-i-made-a-
  mistake?noredirect=1#comment2451919_1410876
  
  I might file a bug report upstream with Debian if I can figure out their
  bugtracking system.

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https://bugs.launchpad.net/bugs/1976198

Title:
  Possible missing dependencies of libsdl2-dev in Jammy

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