Changing to archive.org as recommended does not fix the mime type:
building path(s) `/gnu/store/7fgpnklam8v0fbklqzmgir2ryg3hb79n-font-un-fonts-1.0.2.tar.gz' Starting download of /gnu/store/7fgpnklam8v0fbklqzmgir2ryg3hb79n-font-un-fonts-1.0.2.tar.gz >From >https://web.archive.org/web/20160304052853/http://kldp.net/frs/download.php/4695/un-fonts-core-1.0.2-080608.tar.gz... following redirection to `https://web.archive.org/web/20150807013056/http://kldp.net/frs/download.php/4695/un-fonts-core-1.0.2-080608.tar.gz'... ERROR: Bad media-type header component: .gz failed to download "/gnu/store/7fgpnklam8v0fbklqzmgir2ryg3hb79n-font-un-fonts-1.0.2.tar.gz" from "https://web.archive.org/web/20160304052853/http://kldp.net/frs/download.php/4695/un-fonts-core-1.0.2-080608.tar.gz"; builder for `/gnu/store/lans15ffv24v073jrjadaqs8i307369y-font-un-fonts-1.0.2.tar.gz.drv' failed to produce output path `/gnu/store/7fgpnklam8v0fbklqzmgir2ryg3hb79n-font-un-fonts-1.0.2.tar.gz' cannot build derivation `/gnu/store/2sax0df6xyd1gazvx2wbajc7yg2lzgj6-font-un-fonts-1.0.2.drv': 1 dependencies couldn't be built guix build: error: build failed: build of `/gnu/store/2sax0df6xyd1gazvx2wbajc7yg2lzgj6-font-un-fonts-1.0.2.drv' failed -- ng irc://loupsycedyglgamf.onion:67/~NiAsterisk https://psyced.org:34443/NiAsterisk/ EDN: https://wiki.c3d2.de/Echt_Dezentrales_Netz/en
