OSError: cannot load library 'gobject-2.0'

[BastianZim]

• I read the conda-forge documentation and could not find the solution for my problem there.

See conda-forge/weasyprint-feedstock#23 and https://gitter.im/conda-forge/conda-forge.github.io?at=60c76d5ed855766185d8862a

Full error:

$ python -c "import weasyprint"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/weasyprint/__init__.py", line 469, in <module>
    from .css import preprocess_stylesheet  # noqa isort:skip
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/weasyprint/css/__init__.py", line 27, in <module>
    from . import computed_values, counters, media_queries
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/weasyprint/css/computed_values.py", line 15, in <module>
    from .. import text
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/weasyprint/text.py", line 259, in <module>
    'libgobject-2.0.dylib')
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/weasyprint/text.py", line 255, in dlopen
    return ffi.dlopen(names[0])  # pragma: no cover
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/cffi/api.py", line 150, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/cffi/api.py", line 832, in _make_ffi_library
    backendlib = _load_backend_lib(backend, libname, flags)
  File "/Users/shannon/opt/miniconda3/envs/weasyprint/lib/python3.6/site-packages/cffi/api.py", line 827, in _load_backend_lib
    raise OSError(msg)
OSError: cannot load library 'gobject-2.0': dlopen(gobject-2.0, 2): image not found.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'gobject-2.0'

[BastianZim]

CC @xhochy

[xhochy]

This is happening because of #102, we probably should add this as a separate output so you don't need to depend on the full glib package.

[liZe]

Adding glib to the list of dependencies doesn’t (always?) fix the problem, users have to reinstall the glib package after installing WeasyPrint to make it work. I don’t fully understand what the problem is, but I can try to help if there’s something I can do.

[pkgw]

If users have to reinstall glib, that might mean that weasyprint is overwriting some files from the glib package. Can you look at the file listings associated with the weasyprint package(s) and see if there might be some kind of conflict?

[xhochy]

Looking at https://conda-metadata-app.streamlit.app/?q=conda-forge%2Fnoarch%2Fweasyprint-60.1-pyhd8ed1ab_0.conda, it doesn't seem like weasyprint is a culprit. If there is a need to reinstall, it is somewhere in its dependencies.

[liZe]

I’ve tried to reproduce on a fresh install of both Anaconda and Miniconda on Linux, it worked perfectly for me.

Does anyone have a way to reproduce this problem reliably?