Otherwise on upcoming ncurses-6.3 the build fails as:
video.c:114:26: error: format '%d' expects argument of type 'int',
but argument 3 has type 'long unsigned int' [-Werror=format=]
114 | printw(_("Viewing line %d/%d, 100%%"), lines, lines);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
While at it pull upstream fix for -fcommon toolchains (vanilla gcc-10)
and pending fix for gcc-11.