Starting download of /gnu/store/2p5lc4f7wv7pbr2r0ihqkcz4kjyhxpfm-libpng-1.6.37.tar.xz
From http://downloads.sourceforge.net/project/libpng/libpng16/1.6.37/libpng-1.6.37.tar.xz...
following redirection to `https://nav.dl.sourceforge.net/project/libpng/libpng16/1.6.37/libpng-1.6.37.tar.xz'...

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