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The following error is seen trying to run CCP-EM on some recent Linux versions such as Ubuntu 19 and Fedora 29:
ImportError: .../libfontconfig.so.1: undefined symbol: FT_Done_MM_Var
This can be fixed by running the following command:
CCP4 can be affected by similar issues.
If you still see such errors after trying the command above, run the command again but replace
Some users report problems caused by the OS X Gatekeeper. This can cause a number of different errors including the following:
... cannot be opened because the developer cannot be verified. macOS cannot verify that this app is free from malware.
ImportError: ... code signature in (...) not valid for use in process using Library Validation:
library load disallowed by system policy
In some cases these problems can be fixed by running the following command:
xattr -rc $CCPEM