^CMake Error at .*/Modules/ExternalProject\.cmake:[0-9]+ \(message\):
  External project "MyProj" does not have a step "IFace"\.
Call Stack \(most recent call first\):
  Add_StepDependencies_iface_step\.cmake:[0-9]+ \(ExternalProject_Add_StepDependencies\)
  CMakeLists\.txt:[0-9]+ \(include\)$
