Unknown variable "pppd_plugin_dir" with the flag "-Dppp=false"
In the current master if I try to compile NetworkManager with the flag "-Dppp=false" the following error will be raised:
Configuring config.h using configuration
meson.build:897:15: ERROR: Unknown variable "pppd_plugin_dir".
This is the line with the error https://gitlab.freedesktop.org/NetworkManager/NetworkManager/blob/a75ab799e4f6b9c5d6f298ad7c1899ae21726a48/meson.build#L897