Created attachment 206423 [details]
Powerpc64 switches to Clang soon and it can compile lftp just fine.
Don't switch to GCC if Clang is used in the first place.
Created attachment 206426 [details]
Actually, this port builds with base GCC on powerpc64.
A commit references this bug:
Date: Sun Aug 11 19:50:14 UTC 2019
New revision: 508669
Switch to base compiler on powerpc64
Submitted by: pkubaj