joe@gentoo1 ~/dwm (fibi)> git apply --check --verbose --whitespace=nowarn ../patches/dwm-fibonacci-20200418-c82db69.diff 
Checking patch config.def.h...
error: while searching for:
static const int nmaster     = 1;    /* number of clients in master area */
static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */

static const Layout layouts[] = {
	/* symbol     arrange function */
	{ "[]=",      tile },    /* first entry is default */
	{ "><>",      NULL },    /* no layout function means floating behavior */
	{ "[M]",      monocle },
};

/* key definitions */

error: patch failed: config.def.h:36
error: config.def.h: patch does not apply
Checking patch fibonacci.c...
joe@gentoo1 ~/dwm (fibi) [1]> git apply --reject --verbose --whitespace=nowarn ../patches/dwm-fibonacci-20200418-c82db69.diff
Checking patch config.def.h...
error: while searching for:
static const int nmaster     = 1;    /* number of clients in master area */
static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */

static const Layout layouts[] = {
	/* symbol     arrange function */
	{ "[]=",      tile },    /* first entry is default */
	{ "><>",      NULL },    /* no layout function means floating behavior */
	{ "[M]",      monocle },
};

/* key definitions */

error: patch failed: config.def.h:36
error: while searching for:
	{ MODKEY,                       XK_t,      setlayout,      {.v = &layouts[0]} },
	{ MODKEY,                       XK_f,      setlayout,      {.v = &layouts[1]} },
	{ MODKEY,                       XK_m,      setlayout,      {.v = &layouts[2]} },
	{ MODKEY,                       XK_space,  setlayout,      {0} },
	{ MODKEY|ShiftMask,             XK_space,  togglefloating, {0} },
	{ MODKEY,                       XK_0,      view,           {.ui = ~0 } },

error: patch failed: config.def.h:76
Checking patch fibonacci.c...
Applying patch config.def.h with 2 rejects...
Rejected hunk #1.
Rejected hunk #2.
Applied patch fibonacci.c cleanly.
joe@gentoo1 ~/dwm (fibi) [1]> vim config.def.h.rej
joe@gentoo1 ~/dwm (fibi)> sudo make install clean --dry-run
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 dwm.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 util.c
cc -o dwm drw.o dwm.o util.o -L/usr/X11R6/lib -lX11 -lXinerama -lfontconfig -lXft
mkdir -p /usr/local/bin
cp -f dwm /usr/local/bin
chmod 755 /usr/local/bin/dwm
mkdir -p /usr/local/share/man/man1
sed "s/VERSION/6.5/g" < dwm.1 > /usr/local/share/man/man1/dwm.1
chmod 644 /usr/local/share/man/man1/dwm.1
rm -f dwm drw.o dwm.o util.o dwm-6.5.tar.gz
joe@gentoo1 ~/dwm (fibi)> git add .
joe@gentoo1 ~/dwm (fibi)> git commit -m "added fibi layout patch"
[fibi 2ca52de] added fibi layout patch
 5 files changed, 246 insertions(+), 10 deletions(-)
 create mode 100644 .config.def.h.swp
 create mode 100644 config.h
 create mode 100644 fibonacci.c
joe@gentoo1 ~/dwm (fibi)> sudo make install clean
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
In file included from dwm.c:318:
config.h:54:23: error: ‘spiral’ undeclared here (not in a function)
   54 |         { "[@]",      spiral },
      |                       ^~~~~~
config.h:55:24: error: ‘dwindle’ undeclared here (not in a function)
   55 |         { "[\\]",      dwindle },
      |                        ^~~~~~~
make: *** [Makefile:12: dwm.o] Error 1