--2020-09-23 11:45:53--  https://download.sourceforge.net/libpng/libpng-1.6.37.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-1.6.37.tar.xz has bad BLAKE2B digest: expected 48e8f48a88e0db6fcbc0c0f1a4d5bda6e6c8b03255bacdc60e353256ae41ccc01b5b2a7e0e7b0dea236c53a3b9d1dd89d4bb19445afbebc37bf0f92691452424, got 786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce