Judging from configure parameters probably needs zlib

gnupg/gnupg.spec

@@ -45,8 +45,8 @@ Source1:      ftp://ftp.gnupg.dk/pub/contrib-dk/idea.c.gz
 #   build information
 Prefix:       %{l_prefix}
 BuildRoot:    %{l_buildroot}
-BuildPreReq:  OpenPKG, openpkg >= 20030717, make
-PreReq:       OpenPKG, openpkg >= 20030717
+BuildPreReq:  OpenPKG, openpkg >= 20030717, zlib, make
+PreReq:       OpenPKG, openpkg >= 20030717, zlib
 BuildPreReq:  zlib
 PreReq:       zlib
 AutoReq:      no