--- config.mk.orig	Tue Jan 21 15:22:03 2014
+++ config.mk	Fri Jan 31 15:16:20 2014
@@ -4,22 +4,25 @@ VERSION = 0.6
 # Customize below to fit your system
 
 # paths
-PREFIX = /usr/local
-MANPREFIX = ${PREFIX}/share/man
+PREFIX ?= /usr/local
+MANPREFIX = ${PREFIX}/man
 
+X11INC = ${X11BASE}/include
+X11LIB = ${X11BASE}/lib
+
 # includes and libs
-INCS = -I. -I/usr/include
-LIBS = -L/usr/lib -lc -lX11
+INCS = -I${X11INC}
+LIBS = -L${X11LIB} -lX11
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\" -D_BSD_SOURCE
-CFLAGS = -std=c99 -pedantic -Wall -O0 ${INCS} ${CPPFLAGS}
-LDFLAGS = -s ${LIBS}
+CPPFLAGS += -DVERSION=\"${VERSION}\" -D_BSD_SOURCE
+CFLAGS += -std=c99 -pedantic -Wall -O0 ${INCS} ${CPPFLAGS}
+LDFLAGS += ${LIBS}
 
 # Solaris
 #CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
 #LDFLAGS = ${LIBS}
 
 # compiler and linker
-CC = cc
+CC ?= cc