Meson doesn't find the Boost libraries

The following issue solved my problem:

Boost not detected on Fedora · Issue #2547

I replaced the meson build file by the following:

project('myproj', 'cpp')
cxx = meson.get_compiler('cpp')
boost_dep = [
    cxx.find_library('boost_system'),
    cxx.find_library('boost_filesystem'),
]
executable('myproj', 'main.cpp', dependencies : boost_dep)