--- config.mk.orig	Sat Nov 29 17:18:56 2014
+++ config.mk	Wed Apr 15 22:13:22 2015
@@ -2,20 +2,20 @@
 VERSION = 0.3
 
 # paths
-PREFIX = /usr/local
-MANPREFIX = ${PREFIX}/share/man
+PREFIX ?= /usr/local
+MANPREFIX = ${PREFIX}/man
 
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
+X11INC = ${X11BASE}/include
+X11LIB = ${X11BASE}/lib
 
 # includes and libs
 INCS = -I${X11INC}
 LIBS = -L${X11LIB} -lX11
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\"
-CFLAGS   = -ansi -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS  = -s ${LIBS}
+CPPFLAGS += -DVERSION=\"${VERSION}\"
+CFLAGS   += -ansi -pedantic -Wall ${INCS} ${CPPFLAGS}
+LDFLAGS  += ${LIBS}
 
 # compiler and linker
-CC = cc
+CC ?= cc