Problem with dh_autoreconf when building 2.0.9 .deb

I am trying to use dpkg-buildpackage to build a .deb of SDL 2.0.9 on a RPi (latest raspbian stretch), but I am getting this error:

$ dpkg-buildpackage -B
make[1]: Leaving directory '/home/cam/sdl2/libsdl2-2.0.9+dfsg1'
  dh_auto_test -a
fakeroot debian/rules binary-arch
dh binary-arch
  dh_testdir -a
  dh_update_autotools_config -a
  dh_autoreconf -a
dh_autoreconf: Can only be run once, see dh-autoreconf(7)
debian/rules:46: recipe for target 'binary-arch' failed
make: *** [binary-arch] Error 2
dpkg-buildpackage: error: fakeroot debian/rules binary-arch gave error exit status 2

I have debhelper 10.2.5 and dh-autoreconf 14

Is this a problem with the SDL debian build or with my setup?