[Bug 1956202] Re: `libexpat1-dev` CMake configuration error

[Sandi Vujaković]

This seems to be an upstream issue:
https://github.com/libexpat/libexpat/issues/501

With that said, it doesn't seem like an upstream fix is likely any time
soon, as is suggested by this comment by one of the members of the
`libexpat` GitHub team on this NixOS pull request addressing this issue:
https://github.com/NixOS/nixpkgs/pull/128997#issuecomment-873137856

NixOS seems to have a custom packaging setup, so the fix above is most
likely not applicable.

** Bug watch added: github.com/libexpat/libexpat/issues #501
   https://github.com/libexpat/libexpat/issues/501

** Description changed:

  Using the package provided by Ubuntu Impish results in the following
  CMake configuration error when trying to build OpenColorIO:
  
  ```
  […]
  CMake Error in src/OpenColorIO/CMakeLists.txt:
-   Imported target "expat::expat" includes non-existent path
+   Imported target "expat::expat" includes non-existent path
  
-     "/usr/lib/include"
+     "/usr/lib/include"
  
-   in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:
+   in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:
  
-   * The path was deleted, renamed, or moved to another location.
+   * The path was deleted, renamed, or moved to another location.
  
-   * An install or uninstall procedure did not complete successfully.
+   * An install or uninstall procedure did not complete successfully.
  
-   * The installation package was faulty and references files it does not
-   provide.
+   * The installation package was faulty and references files it does not
+   provide.
  […]
  ```
  
  This wasn't an issue in Ubuntu Hirsute as far as I can recall and is not
  an issue when using the ASWF-provided packages — CMake flag
  `-DOCIO_INSTALL_EXT_PACKAGES=ALL`. A patch is attached that allows
  OpenColorIO to build using system-provided packages.
  
- Related ticket over on the OpenColorIO GitHub repository:
- https://github.com/AcademySoftwareFoundation/OpenColorIO/issues/1415
+ Further information in the related ticket in the OpenColorIO repository:
+ https://github.com/AcademySoftwareFoundation/OpenColorIO/issues/1415#issuecomment-1003826550

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https://bugs.launchpad.net/bugs/1956202

Title:
  `libexpat1-dev` CMake configuration error

Status in expat package in Ubuntu:
  New

Bug description:
  Using the package provided by Ubuntu Impish results in the following
  CMake configuration error when trying to build OpenColorIO:

  ```
  […]
  CMake Error in src/OpenColorIO/CMakeLists.txt:
    Imported target "expat::expat" includes non-existent path

      "/usr/lib/include"

    in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

    * The path was deleted, renamed, or moved to another location.

    * An install or uninstall procedure did not complete successfully.

    * The installation package was faulty and references files it does not
    provide.
  […]
  ```

  This wasn't an issue in Ubuntu Hirsute as far as I can recall and is
  not an issue when using the ASWF-provided packages — CMake flag
  `-DOCIO_INSTALL_EXT_PACKAGES=ALL`. A patch is attached that allows
  OpenColorIO to build using system-provided packages.

  Further information in the related ticket in the OpenColorIO
  repository:
  https://github.com/AcademySoftwareFoundation/OpenColorIO/issues/1415#issuecomment-1003826550

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