>>> Compiling source in /tmp/portage/x11-wm/dwm-5.9/work/dwm-5.9 ... make -j4 CC=x86_64-pc-linux-gnu-gcc XINERAMAFLAGS= XINERAMALIBS= dwm build options: creating config.h from config.def.h CFLAGS = -march=native -O2 -g0 -std=c99 -pedantic -Wall -g -I. -I/usr/include -I/usr/include/X11 -DVERSION="5.9" CC dwm.c LDFLAGS = -Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu -L/usr/lib -lc -L/usr/lib -lX11 CC = x86_64-pc-linux-gnu-gcc CC -o dwm >>> Source compiled.
Fixed in 6.0 without a revision bump.