/ ESMValTool Public
Pin matplotlib to <3.3 and add compilers #1898
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Cartopy 0.17 does not work with matplotlib > 3.2 SciTools/cartopy#1615 and pinning Cartopy to > 0.17 seems to result in an environment that is very difficult to solve (see my attempts in #1893).
Therefore I think it would be best to pin matplotlib to <3.3 for now and try to upgrade again in a month or so.
I also added the
compilerspackage to make sure the conda compilers are always used. This solves an issue I was having in #1893 because cartopy failed to compile when trying to install a newer version of it with pip on top of environment.yml and it also makes sure all R packages are compiling with the correct compilers, the r-base package does have some compiler dependencies, but not all (possibly related to #1816).
This should fix #1894.