anchor.diff:  { stdenv, fetchurl, autoreconfHook
   , doxygen, texlive, python, perl, gmpxx, mpfr, boost
  +, maxAm ? 6
   } :
  +assert
  +  stdenv.lib.asserts.assertMsg
  +  (maxAm <= 7 && maxAm >= 1)
  +  "The maximum angular momentum must be in the interval between 1 and 7";
   
   let
     version = "1.1.5";
  
positive.code:   doCheck = true;
  
    configureFlags = [
      "--with-libint-max-am=6"
      "--with-libderiv-max-am1=5"
    ];
  
    meta = with stdenv.lib; {
  
negative.code:     platforms = platforms.linux;
    };
  }
  