On 2016-08-25 at 09:04, Adam D. Barratt wrote: > On 2016-08-25 10:44, Исаев Виталий wrote: > >> Build-Depends: debhelper (>= 9), cmake, >> flatbuffers (= 1.2.0-1), > > This has nothing to do with mk-build-deps. Given this: > >> ➜ apt-cache policy flatbuffers >> flatbuffers: >> Installed: (none) >> Candidate: 1.4.0-17 >> Version table: >> 1.4.0-17 500 >> 500 http://repo12.mailbuild-2.embarce.ro xenial/local amd64 Packages >> 1.2.0-1 500 >> 500 http://repo12.mailbuild-2.embarce.ro xenial/local amd64 Packages > > apt will prefer to install the latest available version, as listed in > the candidate field, as demonstrated in: > >> Starting 2 pkgProblemResolver with broken count: 1 >> Investigating (0) libhole-cpp-build-deps [ amd64 ] < 1.0.1ubuntu1 > ( >> devel ) >> Broken libhole-cpp-build-deps:amd64 Depends on flatbuffers [ amd64 ] < >> none -> 1.4.0-17 > ( devel ) (= 1.2.0-1) >> Considering flatbuffers:amd64 0 as a solution to >> libhole-cpp-build-deps:amd64 -2 >> Removing libhole-cpp-build-deps:amd64 rather than change >> flatbuffers:amd64 In other words: the problem here is the fact that apt's priorities in this regard are messed up. If there exists a dependency solution which will achieve the result requested on the command line (here, installing the lower version of the depended-on package), that solution should be chosen over any which do not achieve that result; if that solution involves removing or downgrading packages, it should be presented for confirmation before proceeding. If - as is apparently the case - apt does not presently do that, that should IMO be considered a bug. -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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