Changes like these are expected to be included in the next version of GnuPG for VMS, which is expected to be version 1.4.10c.
The builders supplied in the GnuPG 1.4.10b kit expect the cURL object library on an Alpha system to be in a "[.axp]" subdirectory, but modern cURL kits will put it into a "[.alpha]" subdirectory. This can cause GnuPG build failures with various messages involving "CURLLIB". These replacement builder files should detect and use either of the two expected subdirectories on Alpha systems.
/ftp/gnupg/gnupg-1_4_10b_vms/vms/descrip_src.mms