/etc/freefem++.pref is in libfreefem++ 3.26-2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | loadpath += "./"
loadpath += "/usr/lib/freefem++"
includepath += "/usr/include/freefem++/idp"
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