removed CXX line

set(CMAKE_CXX_STANDARD_REQUIRED ON)

# to avoid complaints in conda-forge, see https://conda-forge.org/docs/maintainer/knowledge_base/#newer-c-features-with-old-sdk 

set(CXXFLAGS, "${CXXFLAGS} -D_LIBCPP_DISABLE_AVAILABILITY")

# Set up Anaconda prefix in the case with a non-default conda env is activated

if(EXISTS $ENV{CONDA_PREFIX})

  message("CONDA PREFIX: $ENV{CONDA_PREFIX}")