anchor.diff:      src =
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  -          url = http://eclipse.ialto.com/eclipse/downloads/drops/R-3.7-201106131736/eclipse-SDK-3.7-linux-gtk-x86_64.tar.gz;
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  -          url = http://eclipse.ialto.com/eclipse/downloads/drops/R-3.7-201106131736/eclipse-SDK-3.7-linux-gtk.tar.gz;
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             sha256 = "08rgw85cam51l98mzb39fdc3ykb369v8pap93qhknbs6a3f5dnff";
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positive.code:     src =
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            url = http://ftp-stud.fht-esslingen.de/pub/Mirrors/eclipse/technology/epp/downloads/release/helios/SR2/eclipse-cpp-helios-SR2-linux-gtk-x86_64.tar.gz;
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negative.code:     src =
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          fetchurl {
            url = http://archive.eclipse.org/eclipse/downloads/drops/R-3.6.2-201102101200/eclipse-SDK-3.6.2-linux-gtk-x86_64.tar.gz;
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