"\
\{stdenv, fetchurl\}:\
\n\
stdenv.mkDerivation = \{\
\n  name = \"%{NAME}-%{VERSION}\";\
\n\
\n  src = fetchurl \{\
\n    url = \"%{SOURCE}\";\
\n    sha256 = \"%{FILEDIGESTS}\";\
\n  \};\
\n\};\
\n"
