Mark BROKEN: fails to build

gmake[1]: Entering directory '/wrkdirs/usr/ports/games/tbe/work/tbe-0.9.2.1'
mkdir -p build
cd build && cmake -DCMAKE_BUILD_TYPE=Debug -DWITH_DOCS=on ..
cmake: not found
Makefile:16: recipe for target 'build/src/tbe' failed

Reported by: pkg-fallout