--2020-09-23 11:45:53--  https://download.sourceforge.net/libpng/libpng-1.5.30.tar.xz
Resolving download.sourceforge.net... 216.105.38.13
Connecting to download.sourceforge.net|216.105.38.13|:443... connected.
HTTP request sent, awaiting response... 429 Too Many Requests
2020-09-23 11:45:53 ERROR 429: Too Many Requests.

libpng-1.5.30.tar.xz has bad BLAKE2B digest: expected 02813c7cf06e61d429fe963ae2c1e68bfb390b8eeea52147f582729b4a86c73055c2c79eb3d0b533587dd5a16dc0abf7afd986794c01ec59ae0a7dfe3333a989, got 786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce