What is the simplest way to run pkg-config commands in a dune file [question]?

[UnixJunkie]

Hello,

To compile some C bindings, I would like dune to use the output of some pkg-config commands, such as:

• pkg-config --libs nlopt
• pkg-config --cflags nlopt

Am I dreaming, or dune has not support for creating a variable whose content is the output
of a system command (like the back quoting mechanism in the bash shell) ?

Thanks,
F.