We now have several setups where scripts do meson based build. Very much intentionally these scripts do not set ack_experimental (it would be quite against the reason the option exist, if it was set automatically). So the user gets meson failure telling about ack_experimental, but not how to pass it through the scripts used.
All such scripts (our own ones, can't promise that custom ones implement it) support EXTRA_CONFIG environment variable to pass parameters to meson. Tell that in the ack_experimental error message.
We now have several setups where scripts do meson based build. Very much intentionally these scripts do not set ack_experimental (it would be quite against the reason the option exist, if it was set automatically). So the user gets meson failure telling about ack_experimental, but not how to pass it through the scripts used.
All such scripts (our own ones, can't promise that custom ones implement it) support EXTRA_CONFIG environment variable to pass parameters to meson. Tell that in the ack_experimental error message.