Error while trying to enable "libpanel" feature

[jbernard002]

Hello,

I'm trying to create an application with libpanel feature enabled but I'm getting errors while building libpanel-sys
which indicates that libpanel is not installed on the system.

The system library `libpanel-1` required by crate `libpanel-sys` was not found.
  The file `libpanel-1.pc` needs to be installed and the PKG_CONFIG_PATH environment variable must contain its parent directory.
  PKG_CONFIG_PATH contains the following:
      - /app/lib/pkgconfig
      - /app/share/pkgconfig
      - /usr/lib/pkgconfig
      - /usr/share/pkgconfig

I've already installed libpanel-devel on my system and neither adding the "libpanel" or "panel" dependency in meson.build
solved the problem.
Do you know how to solve it?

Sorry for my lack of knowledge in meson.