Dear Maintainer,

freefem++ fails to build from source when libscotchparmetis-dev is installed.
It fails with:

parmetis.cpp:31:10: fatal error: parmetis.h: No such file or directory
   31 | #include <parmetis.h>
      |          ^~~~~~~~~~~~

Iattach a build log.

The easiest solution is to add a Build-Conflicts against libscotchparmetis-dev.

Cheers,

Adding a conflict will workaround the issue,

but I see this as a bug in the freefem++ configuration scripts. They're
detecting the availability of parmetis (via scotch emulation in this
case) but they are not at the same time setting up the corresponding
include path to parmetis.h.