Capturing output i see text below
==John ffitch

-- Including Custom.cmake file: /home/jpff/Sourceforge/csound/New/csound6/Custom
.cmake
CMake Error at Custom.cmake:55 (add_custom_target):
  add_custom_target cannot create target "myTAGS" because another target with
  the same name already exists.  The existing target is a custom target
  created in source directory "/home/jpff/Sourceforge/csound/New/csound6".
  See documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  CMakeLists.txt:208 (include)