Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up /dwm-6.4/config.def.h ./config.def.h
|--- /dwm-6.4/config.def.h	2022-10-04 19:38:18.000000000 +0200
|+++ ./config.def.h	2023-12-18 11:31:12.178928718 +0100
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 5.
Hunk #2 succeeded at 21.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Only in .: config.h
|diff -up /dwm-6.4/drw.c ./drw.c
|--- /dwm-6.4/drw.c	2022-10-04 19:38:18.000000000 +0200
|+++ ./drw.c	2023-12-18 11:20:02.648918951 +0100
--------------------------
Patching file drw.c using Plan A...
Hunk #1 succeeded at 236.
Hunk #2 succeeded at 272.
Hunk #3 succeeded at 328.
Hunk #4 succeeded at 397.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up /dwm-6.4/drw.h ./drw.h
|--- /dwm-6.4/drw.h	2022-10-04 19:38:18.000000000 +0200
|+++ ./drw.h	2023-12-18 11:18:22.625584159 +0100
--------------------------
Patching file drw.h using Plan A...
Hunk #1 succeeded at 34.
Hunk #2 succeeded at 52.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Only in .: drw.o
|Only in .: dwm
|diff -up /dwm-6.4/dwm.c ./dwm.c
|--- /dwm-6.4/dwm.c	2022-10-04 19:38:18.000000000 +0200
|+++ ./dwm.c	2023-12-18 11:25:53.718924073 +0100
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 55.
Hunk #2 succeeded at 434.
Hunk #3 succeeded at 710.
Hunk #4 succeeded at 721.
Hmm...  Ignoring the trailing garbage.
done