On Thu, 18 May 2017, cociuba mihai wrote:
Even after deleting the file the error persist.
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Apparently there's a file (a regular file, not a directory) on your
system with the name /usr/local/lib/pkgconfig. You should delete this
(it's getting in the way of the gretl install) and try again.
sudo rm -f /usr/local/lib/pkgconfig
make install
What does your "make_install_output" look like now?
Allin Cottrell