The piCore version of  xorg-proto-dev.tcz  seems to be missing several files when compared to the x86 version (xorg-proto.tcz).
When building Tint2, these where reported to be missing:
compositeproto
damageproto
xineramaproto
renderproto
Since  xorg-proto.tcz  from TC-7.x x86 doesn't contain any binaries, I just installed that one on the RPi and Tint2 compiled fine and works.
Adventures me didn't even checked Xorg versions - They differ (1.18.3 vs. 1.18.4). :p
Not sure about xorg-proto though, as the respective .info files both list:
Version:        Various
Have the above mentioned files just been MIA or have they been left out on purpose for the RPi?
Can I continue to use  xorg-proto.tcz  from the TC-7.x x86 repo or is that a stupid idea?