Package build variables (only some examples)

$pkg, $ver, $target, $arch, $stagelevel

$arch_* (e.g. $arch_sizeof_char_p)

$archdir, $confdir, $targetdir, $builddir, $base
$root, $prefix, $bindir, $localstatedir

$autoextract, $autopatch, $createprefix, $runxmkmf

$GCC3_WRAPPER_INSERT, $KCC_WRAPPER_REMOVE

Many, many more ...