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I needed to be able to talk to something that speaks netstrings, so I ported the netstring egg to CHICKEN 5. The patch is attached.

Salmonella reports an installation failure for qrencode: ​http://salmonella-linux-x86-64.call-cc.org/master-debugbuild/gcc/linux/x86-64/2015/07/28/salmonella-report/install/qrencode.html

Since the documentation states it self-contained, I suppose the issue is not related to environment settings.

This was found by Mario's scrutiny/specialization run of Salmonella, see ​http://parenteses.org/mario/misc/specialize-report/install/lzma.html

Attached is a patch that changes the check for null-pointer? to one for #f; c-pointer never returned null-pointer objects anyway, it has always returned #f for NULL pointers AFAIK so I guess this has always been a bug in this egg. While I was writing the patch I noticed an unneccessary begin inside a let (which always has an implicit begin), so I removed that. Then I saw I had a (let ((x ...)) (and x (let ((y ...)) ...))) pattern, which can be simplified to your favorite macro, and-let*. So here's a patch that does that! :)

PS: I wasn't able to test this because in pkgsrc, archivers/lzmalib conflicts with archivers/xz, which is used by graphics/tiff and www/links-gui; graphics/tiff is of course used by lots and lots of packages like print/ghostscript and even editors/emacs! Perhaps it's an idea to change your egg to use archivers/xz instead? It's clearly the more popular of the LZMA libraries...