dwm build options:
CFLAGS   = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os -I/usr/X11R6/include -I/usr/X11R6/include/freetype2 -D_BSD_SOURCE -D_POSIX_C_SOURCE=2 -DVERSION="6.1" -DXINERAMA
LDFLAGS  = -s -L/usr/X11R6/lib -lX11 -lXinerama -lfontconfig -lXft
CC       = cc
CC drw.c
In file included from /usr/include/bits/libc-header-start.h:33:0,
                 from /usr/include/stdio.h:27,
                 from drw.c:2:
/usr/include/features.h:184:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated,
use _DEFAULT_SOURCE" [-Wcpp]
 # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
   ^~~~~~~
In file included from drw.c:6:0:
/usr/include/X11/Xft/Xft.h:39:10: fatal error: ft2build.h: No such file or directory
 #include <ft2build.h>
          ^~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:19: drw.o] Error 1