joe@gentoo1 ~/dwm $ git checkout fullgaps 
Switched to branch 'fullgaps'
joe@gentoo1 ~/dwm $ patch -p1 < ../patches/dwm-fullgaps-6.2.diff 
patching file config.def.h
Hunk #1 succeeded at 2 with fuzz 2.
Hunk #2 succeeded at 97 (offset 12 lines).
patching file dwm.c
Hunk #1 succeeded at 136 (offset 17 lines).
Hunk #2 succeeded at 229 (offset 29 lines).
Hunk #3 succeeded at 729 (offset 89 lines).
Hunk #4 succeeded at 1672 (offset 172 lines).
Hunk #5 FAILED at 1696.
1 out of 5 hunks FAILED -- saving rejects to file dwm.c.rej
joe@gentoo1 ~/dwm $ vim dwm.c.rej 
joe@gentoo1 ~/dwm $ git add .
joe@gentoo1 ~/dwm $ git commit -m "added fullgaps patch"
[fullgaps da96bd4] added fullgaps patch
 6 files changed, 199 insertions(+), 10 deletions(-)
 create mode 100644 config.h
joe@gentoo1 ~/dwm $ sudo make install clean
Password: 
cc -c -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os -I/usr/X11R6/include -I/usr/include/freetype2 -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700L -DVERSION=\"6.5\" -DXINERAMA drw.c
cc -c -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os -I/usr/X11R6/include -I/usr/include/freetype2 -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700L -DVERSION=\"6.5\" -DXINERAMA dwm.c
dwm.c: In function ‘createmon’:
dwm.c:732:20: error: ‘gappx’ undeclared (first use in this function)
  732 |         m->gappx = gappx;
      |                    ^~~~~
dwm.c:732:20: note: each undeclared identifier is reported only once for each function it appears in
dwm.c: At top level:
dwm.c:1676:1: warning: ‘setgaps’ defined but not used [-Wunused-function]
 1676 | setgaps(const Arg *arg)
      | ^~~~~~~
make: *** [Makefile:12: dwm.o] Error 1