Well... Some additional information for these various failures would make it a lot easier to debug.
I would suggest using your existing bk to clone the bk source and then build it and then copy make failures here.
bk clone -rbk-7.3ce bk://bkbits.net/bk/bugfix bk-7.3
Building from the repository works in more cases because if it can't find some dependency like tomcrypt, it can clone our copy of the library and keep going.
If you have problems then add it here.