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could you please provide

could you please provide exact git command line to fetch exactly the branch you use?
Debian repo (tag system) is unknown for me, so I do not know what tag i need to fetch.

Most likely, debian people has used bad patch from libraw-0.18 (for gcc6 compatibility). This patch (circulating around internet) broke vng interpolation code (but makes libraw source compatible with gcc6)

-- Alex Tutubalin @LibRaw LLC