ports/emulators/rtc fails with same error as nvidia

[SnowBuddha <snowbuddha@xxxxxxxxx>]

While trying to build mplayer with rtc support, I found out that rtc
will not build. This is the error ones receives:

===>  Extracting for rtc-2004.02.24.1_4
===>  Patching for rtc-2004.02.24.1_4
===>  Configuring for rtc-2004.02.24.1_4
===>  Building for rtc-2004.02.24.1_4
make: don't know how to make vnode_if.h. Stop
*** Error code 2

Stop in /usr/ports/emulators/rtc.

If it looks famliliar, that is because it is the same error one gets
when they try to compile the nvidia driver.  Hopefully this helps
someone find the solution.  Keep up the hard work guys!