I don't think you compiled a ramdisk. The ramdisk users distrib/special/md5 to build a binary with fewer included components, otherwise it won't fit on the media.
At least this isn't right:
#endif /* !defined(SHA2_ONLY) */
SHA2_CTX sha2;
+ SHA3_CTX sha3;
You can inspect the Makefile there and make the SHA2_ONLY #ifdefs
work right.
