cmake DUNE_SYS_HAS_XCAMERA_H examples

LSTS/dune cmake/Libraries/Xeneth.cmake :38 

else(DUNE_SYS_HAS_LIB_XENETH AND DUNE_SYS_HAS_XCAMERA_H)

LSTS/dune cmake/Libraries/Xeneth.cmake :40 

endif(DUNE_SYS_HAS_LIB_XENETH AND DUNE_SYS_HAS_XCAMERA_H)