anchor.diff:      bzip2
       cpio
       db
  -    elfutils
       file
       libarchive
  +    libelf
       nspr
       nss
       popt
  
positive.code:   '';
  
    configureFlags = [
      "--with-external-db"
      "--without-lua"
      "--enable-python"
    ];
  
    # Note: we don't add elfutils to buildInputs, since it provides a
    # bad `ld' and other stuff.
    NIX_CFLAGS_COMPILE = [
      "-I${nspr}/include/nspr"
      "-I${nss}/include/nss"
      "-I${elfutils}/include"
    ];
  
    NIX_CFLAGS_LINK = "-L${elfutils}/lib";
  
    preFixup = /* Configure does not remove unused variables */ ''
      sed -i $out/lib/pkgconfig/rpm.pc \
  
negative.code: , cpio
  , db
  , file
  , libarchive
  , libelf
  , nspr
  , nss
  , popt
  