Improve error messages when cmake can't find optional things
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@ -18,7 +18,7 @@ set(all_scel_sources ${scel_sources} sclang-vars.el)
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if (SC_EL_BYTECOMPILE)
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find_program(EMACS_EXECUTABLE emacs)
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if(NOT EMACS_EXECUTABLE)
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message(SEND_ERROR "Emacs could not be found")
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message(SEND_ERROR "Emacs could not be found.\n (If emacs interface is not required, then set SC_EL=no)")
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endif()
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foreach (el ${all_scel_sources})
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