I am having a problem passing parameters as a variable into 
ExternalProject_Add(). I seem to be fighting syntax, i've tried many different 
variants with the set() statement


#######################

# Default behavior is to NOT install library, empty quotes should disable 
install
set( libxxx_inst_comm INSTALL_COMMAND "\"\"" )

# Build the library as an external project
  ExternalProject_Add( libxxx
    SOURCE_DIR ${PROJECT_SOURCE_DIR}/src
    ${libxxx_inst_comm}
  )
#######################

I get this message, which appears to be within ExternalProject_add() using 
add_custom_command.  Is there a way around this?


CMake Error at 
/opt/homebrew-cask/Caskroom/cmake/3.2.2/CMake.app/Contents/share/cmake-3.2/Modules/ExternalProject.cmake:1487
 (add_custom_command):

  COMMAND may not contain literal quotes:


    ""

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