rpm --checksig --nopgp -vv netscape-navigator-4.7-1.i386.rpm gives: D: New Header signature D: Signature size: 149 D: Signature pad : 3 D: sigsize : 152 D: Header + Archive: 3215728 D: expected size : 3215728 netscape-navigator-4.7-1.i386.rpm: Header+Archive size OK: 3215728 bytes MD5 sum OK: cbd99ddb48b79002178d716b579a0054 exec failed! Could not run gpg. Use --nogpg to skip GPG checks. The suggestion actually works; --nogpg prevents the error. What is GPG ???
Gnu Privacy Guard; http://www.gnupg.org/ It's what the package is actually signed with...