misc/vxl contains and installs a bundled copy of "bzip2/libbzip2 version 1.0.8 of 13 July 2019" including header files. $ pi -ql vxl-3.3.2_3 | grep bz /usr/local/include/vxl/v3p/bzlib/bzlib.h /usr/local/include/vxl/v3p/bzlib/bzlib_private.h /usr/local/lib/libbzip2.so /usr/local/lib/libbzip2.so.3.3 /usr/local/lib/libbzip2.so.3.3.2.0 When the package is installed, other ports will detect this instance during build and silently link to it. From my local experiences, affected ports were at least: * archivers/libzip * print/freetype2