For CentOS 8, there should be no difference between the ChimeraX 1.1 and ChimeraX 1.2 dependency on LLVM.  There is no direct dependency on LLVM.  The dependency comes from ChimeraX's dependency on CentOS 8's mesa-libOSMesa.  No version number is given for mesa-libOSMesa, so any version your system provides should work.  The version of LLVM needed by mesa-libOSMesa varies depending on which version of CentOS 8 you have installed.  On our CentOS 8 build VM, it happens to be LLVM version 10.  On a CentOS Stream 8 machine I have access to, it is LLVM version 12.  The CentOS 8 ChimeraX 1.2 rpm installs on both.

So I believe the problem is something to do with your particular setup.  I hope I have given you enough clues to figure it out .

    -- Greg

Hi, 

We were trying to install ChimerX 1.2 on our Centos 8 system.

It seems like ChimeraX 1.2 asks for libLLVM with version 10 which is not a default package that built in the rpm. The default one for CentOS 8 is version 9. Centos 7 does not provide and not available in EPEL either. Could ChimeraX provide the corresponding library for centos 8 and 7?

Another question that I have is if the following is correct for ChimeraX 1.1: ChimeraX 1.1 is using the default libLLVM3.9-mesa.so for centos 8. And for centos 7, you have ChimeraX 1,1 using the libOSMesa.so.8.0.0 which ChimeraX provided, as I see ChimeraX 1.1 works fine one both, but not 1.2.

Best,

Zhe

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