Dear all,

I am relatively new to EasyBuild and I am trying to get my head around how the EasyConfig files work in the following example:

The GROMACS molecular dynamics code can be patched with the so called PLUMED plugin. The standard GROMACS EasyConfig file for the foss-2018b tool-chain look like this:

https://github.com/easybuilders/easybuild-easyconfigs/blob/develop/easybuild/easyconfigs/g/GROMACS/GROMACS-2018.2-foss-2018b.eb

Now recently, in the development branch, a new EasyConfig for GROMACS has been added which includes the mentioned PLUMED patch:

https://github.com/easybuilders/easybuild-easyconfigs/blob/develop/easybuild/easyconfigs/g/GROMACS/GROMACS-2018.1-foss-2018b-PLUMED.eb

The only difference being here (besides being gromacs version 2018.1 instead of 2018.2) the addition of:

*    dependencies = [**
**        ('PLUMED', '2.4.2'),**
**    ]*

So my question is, how does EasyBuild know that it has to patch GROMACS using PLUMED? Is this written in the EasyConfig of PLUMED itself? Is it inside the EasyBlocks? When I do this by hand, I have to build PLUMED first, go to the source directory of GROMACS, run PLUMED in there to patch the source files and then compile GROMACS.

As a followup, if I wanted to create an EasyConfig for GROMACS+PLUMED with GPU support enabled, would I then just have to modify the existing GROMACS EasyConfig for the fosscuda tool-chain in the same way?

Many thanks
Sebastian

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