OSX/CI: kdevelop build failure on branch framework

[Marko Käning]

Suddenly seeing this CMake error popping up on OSX/CI system:



-- Configuring done
CMake Error at projectmanagers/cmake/CMakeLists.txt:87 (add_library):
  Cannot find source file:

    duchain/declarationbuilder.cpp

  Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
  .hxx .in .txx


CMake Error: CMake can not determine linker language for target: kdevcmakemanager
CMake Error: Cannot determine link language for target "kdevcmakemanager".
CMake Warning (dev):