Input buildinfo: https://buildinfos.debian.net/buildinfo-pool/p/pspp/pspp_1.5.4-3_amd64.buildinfo
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Get source package info: pspp=1.5.4-3
Source URL: http://snapshot.notset.fr/mr/package/pspp/1.5.4-3/srcfiles?fileinfo=1
No source info found for pspp-1.5.4-3