As noted in bug https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262008 for Libreoffice, the newest version of libreoffice requires OpenJPEG 2.4, and will fail to build if openjpeg 1.5 is installed.

Openjpeg 1.5 is NOT marked as a conflict for OpenJPEG 2.4, and is explicitly required by tex-web2c --- so at the moment is is impossible to install tex-web2c (or anything that requires it) *and* the current version of libreoffice at the same time.

But it does not look like tex-web2c even *uses* openjpeg:   
for i in `pkg info -l tex-web2c | grep bin` ; do   ldd $i; done | grep jpeg 
returns nothing at all, making it look like this is an unnecessary dependency.

If tex-web2c does not use openjpeg at all, then the dependency should be removed.  If it can use openjpeg 2.4 instead, it should so that the obsolete openjpeg15 can be removed.

If openjpeg15 really *does* have to be installed for tex-web2c to work, then something will have to be done to make it properly coexist with 2.4 so that libreoffice can build.