Hi,

on one of the workstations here coot version 0.8.9.1 crashes.
/software/coot/0.8.9.1/bin//coot: line 284: 30682 Illegal instruction     (core 
dumped) $coot_bin "$@"
guile: error while loading shared libraries: libltdl.so.3: cannot open shared 
object file: No such file or directory

On another workstation (using the same coot install on an NFS drive) this 
version works. Both have RHEL 7.6 installed with Kernel 
3.10.0-957.21.3.el7.x86_64
I compared the list of installed packages but could not find differences that 
could explain this different behavior.

Only difference I see is the CPU generation. The working machine does support 
AVX2, the non-working not.
Does coot depend on AVX2?

The older version 0.8.8 does work on both machines.

Regards, Andreas

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