dlopen() failed to load a library: cairo / cairo-2

[marvinmirtschin]

Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\cairosvg\surface\__init__.py", line 25, in <module>
    import cairocffi as cairo
  File "C:\Python34\lib\site-packages\cairocffi\__init__.py", line 46, in <module>
    cairo = dlopen(ffi, 'cairo', 'cairo-2')
  File "C:\Python34\lib\site-packages\cairocffi\__init__.py", line 43, in dlopen
    raise OSError("dlopen() failed to load a library: %s" % ' / '.join(names))
OSError: dlopen() failed to load a library: cairo / cairo-2

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\marvin.mirtschin\Documents\cairotest.py", line 1, in <module>
    import cairosvg
  File "C:\Python34\lib\site-packages\cairosvg\__init__.py", line 27, in <module>
    from . import surface
  File "C:\Python34\lib\site-packages\cairosvg\surface\__init__.py", line 30, in <module>
    import cairo  # pycairo
ImportError: No module named 'cairo'

I read in an issue before, you can you cairocffi or pycairo but cffi seems not to work for me.

[liZe]

Looks like you don't have cairo installed.

As explained on the cairo download page, the official way to install cairo seems to be to install Gtk+.

They are currently different Gtk+ installers, such as:

• http://www.gtk.org/download/windows.php (preferred solution based on MSYS2)
• https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer (almost up-to-date installer, for 64bit systems)
• http://gtk-win.sourceforge.net/home/index.php/Main/Downloads (quite old)

[marvinmirtschin]

Thanks a lot !

[liZe]

@marvinmirtschin Just for the record, which version of the installer did you use?

[marvinmirtschin]

I used the GTK2-Runtime installer.
It's the one you get to from https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer

[zhaojigang]

@marvinmirtschin I meet the same error
"OSError: dlopen() failed to load a library: cairo / cairo-2"
How did you solve it?

[liZe]

Correctly installing Cairo on Windows is a nightmare. Being careful about 32/64bit seems to be important. You can follow very carefully the steps of the WeasyPrint documentation and see if it helps.

[bzamecnik]

On OS X (eg. El Capitan) this helped me:

export DYLD_FALLBACK_LIBRARY_PATH=$DYLD_FALLBACK_LIBRARY_PATH:/usr/local/lib

[gclsoft]

@liZe I've installed gtk, and add C:\Work2\msys64\mingw64\bin to the PATH. But still OSError: dlopen() failed to load a library: cairo / cairo-2

[gclsoft]

I've installed https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer and set PATH. But still failed at OSError: dlopen() failed to load a library: cairo / cairo-2

[liZe]

@gclsoft There's nothing more I can say that's not said in the documentation. Please remove all the versions of Python and Cairo installed on your system and follow the steps, not mixing 32/64bit packages.

[MarcG046]

I had also Inkscape installed which has its own libcairo-2.dll and appeared before GTK in the PATH
(discovered it by debugging through cairocffi_init_.py)
Changing the order in the PATH 'solved' it for me.

[kinkoazc]

Yup, make sure the Python<->GTK archs match up.

[apacha]

If you think, you've installed everything correctly, you can verify this, but running

import ctypes.util
ctypes.util.find_library('cairo')
ctypes.util.find_library('cairo-2')
ctypes.util.find_library('libcairo-2')

And see, which one has the correct path. If only libcairo-2 has the correct path, you might have to edit %PYTHON_HOME%\Lib\site-packages\cairocffi\__init__.py and add 'libcairo-2' into that list. At least, this fixed the problem for me.

Edit: Installing cairo for Python is probably easiest, if you install it via conda install cairo

[sega97]

On Win7, changing the order in the PATH 'solved' it for me. Put the GTK path before Python path.

[marius778]

I did execute, recommended by a user above.

export DYLD_FALLBACK_LIBRARY_PATH=$DYLD_FALLBACK_LIBRARY_PATH:/usr/local/lib

How can I reverse it?

Thanks

[johncrosby]

This helped me on a mac: https://weasyprint.readthedocs.io/en/stable/install.html#macos