/usr/share/gnudatalanguage/mpfit/ is in gdl-mpfit 1.85+2017.01.03-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnudatalanguage/mpfit/linfitex.pro
/usr/share/gnudatalanguage/mpfit/mpchilim.pro
/usr/share/gnudatalanguage/mpfit/mpchitest.pro
/usr/share/gnudatalanguage/mpfit/mpcurvefit.pro
/usr/share/gnudatalanguage/mpfit/mpfit.pro
/usr/share/gnudatalanguage/mpfit/mpfit2dfun.pro
/usr/share/gnudatalanguage/mpfit/mpfit2dpeak.pro
/usr/share/gnudatalanguage/mpfit/mpfitellipse.pro
/usr/share/gnudatalanguage/mpfit/mpfitexpr.pro
/usr/share/gnudatalanguage/mpfit/mpfitfun.pro
/usr/share/gnudatalanguage/mpfit/mpfitpeak.pro
/usr/share/gnudatalanguage/mpfit/mpftest.pro
/usr/share/gnudatalanguage/mpfit/mpnormlim.pro
/usr/share/gnudatalanguage/mpfit/mpnormtest.pro
/usr/share/gnudatalanguage/mpfit/mpproperr.pro
/usr/share/gnudatalanguage/mpfit/tnmin.pro