Building tests fails with demos disabled

[hasufell]

With the following configuration, building tests fails at linking stage:

-DBUILD_BULLET2_DEMOS:BOOL=FALSE
-DBUILD_CPU_DEMOS:BOOL=FALSE
-DBUILD_OPENGL3_DEMOS:BOOL=FALSE
-DBUILD_UNIT_TESTS:BOOL=TRUE

Error:

[100%] Linking CXX executable Test_PhysicsClientServer
/usr/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu-ld: cannot find -lBussIK
collect2: error: ld returned 1 exit status
make[2]: *** [test/SharedMemory/CMakeFiles/Test_PhysicsClientServer.dir/build.make:1170: test/SharedMemory/Test_PhysicsClientServer] Error 1
make[1]: *** [CMakeFiles/Makefile2:1450: test/SharedMemory/CMakeFiles/Test_PhysicsClientServer.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

[wxmerkt]

We are running into the same issue - turning the Bullet2_demos off in our case was the offensive one. Perhaps a CMake check for incompatible options could resolve this?