OpenBabel3Config.cmake: "The following imported targets are referenced but are missing: maeparse coordgen"

[chedatomasz]

Environment Information

Operating system and version: Ubuntu 20.04

I am trying to build openbabel from source.
I installed swig, eigen and zlib.
I am running CMake 3.20.5
I cloned the repo, configured with:
cmake .. -DRUN_SWIG=ON -DPYTHON_BINDINGS=ON
built, and installed. It passed most tests.
The problem arises when importing the package with cmake (if you're reading this because you're building gnina, use make -DWITH_MAEPARSER=OFF -DWITH_COORDGEN=OFF -DPYTHON_BINDINGS=ON -DRUN_SWIG=ON .. to bypass this issue):
find_package(OpenBabel3 REQUIRED)

This results in the following message:
`
CMake Error at CMakeLists.txt:68 (find_package):
Found package configuration file:

/usr/local/lib/cmake/openbabel3/OpenBabel3Config.cmake

but it set OpenBabel3_FOUND to FALSE so package "OpenBabel3" is considered
to be NOT FOUND. Reason given by package:

The following imported targets are referenced, but are missing: maeparser
coordgen
`

in /usr/local/lib, I can see libmaeparser.so and libcoordgen.so.

Possibly relevant lines from cmake output:
-- Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found version "1.71.0") found components: program_options iostreams -- Found Eigen3: /usr/include/eigen3 (Required is at least version "2.91.0") -- Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found version "1.71.0") found components: filesystem iostreams unit_test_framework -- maeparser include dir set as 'maeparser_INCLUDE_DIRS-NOTFOUND' -- maeparser libraries set as 'maeparser_LIBRARIES-NOTFOUND' -- Building existing MaeParser 'v1.2.3' source at /media/chedat/exchg/ligands/gnina/from_source/openbabel/external/maeparser-v1.2.3. -- Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found version "1.71.0") found components: iostreams -- Using zlib library for iostreams dependency. -- Maestro formats will be supported. Using MaeParser 'v1.2.3' at /media/chedat/exchg/ligands/gnina/from_source/openbabel/external/maeparser-v1.2.3 -- coordgen include dir set as coordgen_INCLUDE_DIRS-NOTFOUND -- coordgen libraries set as 'coordgen_LIBRARIES-NOTFOUND' -- Building existing Coordgen 'master' source at /media/chedat/exchg/ligands/gnina/from_source/openbabel/external/coordgen-master. -- Coordinate generation with Coordgen will be supported Using Coordgen 'master' at /media/chedat/exchg/ligands/gnina/from_soure/openbabel/external/coordgen-master

I can see similar behaviour reported in #2305 and a supposed fix in #2315, however, building from the master branch does not alleviate the issue.

I also tried compiling 3.1.1 and 3.0.0 - same problem.

Unfortunately, I am not familiar with CMake enough to debug this further.

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[chedatomasz]

I dug a bit deeper. The error appears in the generated OpenBabel3_EXPORTS.cmake. In line 103, it checks whether the targets for maeparser and coordgen are set. They are not, as the coordgen-config.cmake and maeparser-config.cmake, present in /usr/local/lib/cmake, are never searched for or imported.
If I understand correctly, creation of those files happens around line 717 in the top level CMakeLists.txt