Andrea, you were right In my chroot launching cin with cms enabled and pointing CIN_CM_PROFILE at non-existent profile created crash! I think I fixed this one by only applying transform if it was created successfully. Please retest and provide full terminal output I also tested my x265 4.2 patch for compiling on i586 on x86-64 where it seems to work? Attached whole series I have applied at the moment git format-patch -o /dev/shm/x265_upd_2 5d80a9c9723f618b135b5721d5b413198cb442e4 /dev/shm/x265_upd_2/0001-Add-two-patches-for-decoding-hevc-alpha.patch /dev/shm/x265_upd_2/0002-Add-combined-hevc-alpha-decoding-patch.patch /dev/shm/x265_upd_2/0003-Add-simple-hevc-alpha-encode-profile-with-hvc1-tag.patch /dev/shm/x265_upd_2/0004-Fix-h265_alpha-profile.patch /dev/shm/x265_upd_2/0005-Guard-against-failed-hTransform-in-newly-added-cms-c.patch /dev/shm/x265_upd_2/0006-Fix-x265-4.2-build-on-i586.patch