The net/tightvnc 1.2.4 port does not install man pages.
The Makefile provides no rationale, so I assume this is a bug.
The Makefile runs vncinstall with a single argument, instead of two.

A separate very minor Makefile issue is that the a "make fetch"
fails if you already have vnc installed, due to the "if exists".
It'd be nice if that check was delayed until the "make install".

Fix: do-install:
-       @(cd ${WRKSRC}; ./vncinstall ${PREFIX}/bin)
+       @(cd ${WRKSRC}; ./vncinstall ${PREFIX}/bin ${PREFIX}/man)
 .for file in Xvnc vncviewer vncpasswd vncconnect
        @strip ${PREFIX}/bin/${file}
 .endfor
How-To-Repeat:  # cd net/tightvnc; make install
 ...
 Warning: directory /man1 not found; not installing manual pages
 ...