Thanks for considering contributing! I'm hesitant to add this, in particular to 1.2 which is in maintanance mode and will only receive critical bug fixes. What is the reason you want Meson support? Given TCLAP is a headers-only library most users don't even bother to build and building and testing is mostly for TCLAP devs and folks that wan to install the documentation. Do you really need to build anything as part of the Meson's WrapDB project, or could you simply depend on the include/tclap/......
Added sys/filio.h to oldstyle
fixes done for 0.4.0
Added sys/filio.h that is needed on solaris to get FIONREAD
Added check for sys/filio.h
More doxycomments
Updated with new installation instructions etc
This file is deprecated by using autotools