Version 0.2.6 - ASN.1 parser accepts these kinds of integer definitions: "INTEGER (5 | 10)" and "INTEGER (5)" - Comments start at "--" and finish at the "end of line" or with another "--".
ftp://ftp.gnupg.org/gcrypt/alpha/gnutls/libtasn1
in portage, even though gnutls now uses its own included libminitasn1