configure --disable-plugin will actually enable it

[M95D]

Run ./configure --disable-plugin.
After several lines of output:

configure: Enabling support for External Public Key Authentication

This is the opposite of --disable.

I saw that --disable-plugin is not documented in ./configure --help, instead, --enable-plugin is documented, but it should be accepted, according to:

  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]