lzmalib installs /usr/local/lib/liblzma.so which conflicts with the base system /usr/lib/liblzma.so. This can cause problems, see for example https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210626 and https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209355 According to the research in these bug reports, the lzmalib port is needed only by archivers/p5-Compress-Raw-Lzma and databases/tokyocabinet. I just tried to build PMQS/Compress-Raw-Lzma-2.074.tar.gz directly from CPAN without the lzmalib port, and it worked (all tests passed), so it seems that at least p5-Compress-Raw-Lzma does not need the lzmalib port. Maybe the same is the case for tokyocabinet. I think it would be good if the lzmalib port could be removed to reduce potential confusion.
I noticed some other ports use lzmalib if it is installed (last seen with the libxslt port - blocked on my system recent memcached update - following the move of libevent. Another time libreoffice don't stated with a error message pointed to lzmalib). If lzmalib is removed, it is only needed to rebuild this port. This problem should mentioned in /usr/ports/UPDATING (I think some other users will have same problems)
And:_ pkg install qt5-webkit New packages to be INSTALLED: qt5-webkit: 5.7.1 lzmalib: 0.0.1_1 don't know why, there is no dependency.
Forget my previous post. Pkg_libchk told me nothing, portmaster --check-depends told me nothing. Pkg check -d states some ports/packages missing liblzma.so.1 after I removed lzmalib. I had to recompile this ports. This fixed this issue.
pkg install qt5-webkit shows: New packages to be INSTALLED: qt5-webkit: 5.212.0.a2_5 [FreeBSD] qt5-webchannel: 5.9.4 [FreeBSD] gstreamer1-plugins-core: 1.12 [FreeBSD] gstreamer1-plugins-pango: 1.12.3 [FreeBSD] gstreamer1-plugins-ugly: 1.12.3 [FreeBSD] gstreamer1-plugins-theora: 1.12.3 [FreeBSD] gstreamer1-plugins-resindvd: 1.12.3 [FreeBSD] gstreamer1-plugins-good: 1.12.3 [FreeBSD] gstreamer1-plugins-dvdread: 1.12.3 [FreeBSD] gstreamer1-plugins-dts: 1.12.3 [FreeBSD] gstreamer1-libav: 1.12.3_1 [FreeBSD] gstreamer1-plugins-png: 1.12.3 [FreeBSD] gstreamer1-plugins-vorbis: 1.12.3 [FreeBSD] gstreamer1-plugins-ogg: 1.12.3 [FreeBSD] gstreamer1-plugins-mpg123: 1.12.3 [FreeBSD] gstreamer1-plugins-a52dec: 1.12.3 [FreeBSD] qt5-location: 5.9.4 [FreeBSD] qt5-sensors: 5.9.4 [FreeBSD] and pkg info liblzma pkg: No package(s) matching liblzma Overcome by events, so I close here