MacPorts: touch: /opt/local/share/icons/hicolor/icon-theme.cache: Operation not permitted

[Schamschula]

As I was updating the MacPorts Portfile to version 2.4.4.1, I got the following error:

-- Installing: /opt/local/var/macports/build/_Users_marius_Development_MacPorts_ports_math_cadabra2/cadabra2/work/destroot/opt/local/share/applications/cadabra2-gtk.desktop
touch: /opt/local/share/icons/hicolor/icon-theme.cache: Operation not permitted
gtk-update-icon-cache-3.0: No theme index file.
-- Installing: /opt/local/var/macports/build/_Users_marius_Development_MacPorts_ports_math_cadabra2/cadabra2/work/destroot/opt/local/share/man/man1/cadabra2-gtk.1

Needless to say, this operation should be done during the activation phase, not when installing into the destroot.

See: macports/macports-ports@fc32e62