Hello all,<br /><br />I am trying to upgrade libpng_1.6.39 in a Debian Bookworm–based image.<br />My goal is to get APNG support and a few newer APIs, so I patched libpng<br />1.6.45 with APNG support and want it to replace the default 1.6.39.<br /><br />What I did:<br /><br />* Added a recipe libpng1.6_1.6.45 (with APNG patch).<br /><br />* All recipes that need it have DEPENDS on libpng1.6_1.6.45 and also<br />  DEBIAN_DEPENDS/DEBIAN_BUILD_DEPENDS set to libpng (&gt;= 1.6.45).<br /><br />* Pinned my local Isar repo for libpng* packages in apt conf.<br /><br />* Set PREFERRED_VERSION_libpng1.6 = "1.6.45".<br /><br />Results:<br /><br />* On amd64 builds everything works fine: the new libpng is built, packaged, and<br />  installed.<br /><br />* On arm64 builds (e.g. rpi5), libpng 1.6.45 is also built and packaged fine,<br />  but system build fails when installing dependencies.<br /><br />The error always looks like this (excerpt):<br /><br />The following packages have unmet dependencies:<br /> libgdk-pixbuf-2.0-0 : Depends: libpng16-16 (&gt;= 1.6.2-1) but it is not installable<br /><br />Or, in the longer resolver log:<br /><br />sbuild-build-depends-main-dummy:arm64 : Depends: libpng-dev:arm64 (&gt;= 1.6.45) but it is not going to be installed<br />...<br />libgdk-pixbuf-2.0-0 : Depends: libpng16-16 (&gt;= 1.6.2-1) but it is not installable<br /><br /><br />It looks like cross builds handle dependencies differently, and the resolver<br />doesn’t see my locally built libpng16-16 as satisfiable on arm64 (while amd64 works fine).<br />I verified that the arm64 package itself is fine — when I install it manually on an<br />rpi5 Bookworm image, it installs and works correctly — so the issue seems to be<br />somewhere in Isar’s dependency resolution.<br /><br />Question:<br />Has anyone successfully replaced a system library like libpng with a newer version on<br />cross builds in Isar? Is there something extra I need to do so that the resolver picks<br />up my libpng16-16 (1.6.45) package instead of failing with “not installable”?<br /><br />Any hints would be greatly appreciated.<br /><br />Best regards,<br /> Jani

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