anchor.diff:    configureScript = "./bootstrap.sh";
     configureFlags = "--with-icu=${icu} --with-python=${python}/bin/python";
   
  -  buildPhase = "./bjam -sEXPAT_INCLUDE=${expat}/include -sEXPAT_LIBPATH=${expat}/lib --layout=${finalLayout} variant=${variant} threading=${threading} link=${link} install";
  +  buildPhase = "./bjam -sEXPAT_INCLUDE=${expat}/include -sEXPAT_LIBPATH=${expat}/lib --layout=${finalLayout} variant=${variant} threading=${threading} link=${link} ${cflags} install";
   
     installPhase = ":";
   }
  
positive.code:     (enableShared && enableStatic)) then
      "tagged" else "system";
  
  in
  
  stdenv.mkDerivation {
  
negative.code: , enableMultiThreaded ? true
  , enableShared ? true
  , enableStatic ? false
  , enablePIC ? false
  }:
  
  let
  