Doxygen initialization fails on Ubuntu 20.04 works on 18.04
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- C++
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Description
In my [doc/Jamfile](https://github.com/boostorg/gil/blob/1e8526797e3327fd1bed7c2ace092fad5fd5ee74/doc/Jamfile#L12-L13), I have this
```
.doxygen = [ doxygen.name ] ;
.doxygen ?= doxygen ;
```
On Ubuntu 20.04, I'm observing the Doxygen initialisation failure:
On Ubuntu 18.04, `b2` succeeds to build the dox
Both environments,
- WSL 2
- using the same version of Doxygen and Boost.Build
- using Boost superproject reset to `develop` branch with latest `b2` bootstrapped
- building `libs/gil/doc` having the `libs/gil` submodule also at `develop` branch
This is a peculiar issue but I have no idea what is going on, so documenting it here.
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