removed the CONFIG variable from config.mk, renamed config.h into config.default.h, after first clone/extract one needs to copy config.default.h to config.h, that is easier than always heavy typing make CONFIG=blafasel
# dwm version
VERSION = 0.6
# Customize below to fit your system
# paths
PREFIX = /usr/local
MANPREFIX = ${PREFIX}/share/man
X11INC = /usr/X11R6/include
X11LIB = /usr/X11R6/lib
# includes and libs
INCS = -I/usr/lib -I${X11INC}
LIBS = -L/usr/lib -lc -L${X11LIB} -lX11
# flags
CFLAGS = -O3 ${INCS} -DVERSION=\"${VERSION}\"
LDFLAGS = ${LIBS}
#CFLAGS = -g -Wall -O2 ${INCS} -DVERSION=\"${VERSION}\"
#LDFLAGS = -g ${LIBS}
# compiler
CC = cc