$OpenBSD: patch-config_mk,v 1.10 2015/11/11 09:27:13 jung Exp $
--- config.mk.orig	Sun Nov  8 23:39:37 2015
+++ config.mk	Mon Nov  9 21:14:22 2015
@@ -4,11 +4,11 @@ VERSION = 6.1
 # Customize below to fit your system
 
 # 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
 
 # Xinerama, comment if you don't want it
 XINERAMALIBS  = -lXinerama
@@ -16,7 +16,7 @@ XINERAMAFLAGS = -DXINERAMA
 
 # freetype
 FREETYPELIBS = -lfontconfig -lXft
-FREETYPEINC = /usr/include/freetype2
+#FREETYPEINC = /usr/include/freetype2
 # OpenBSD (uncomment)
 FREETYPEINC = ${X11INC}/freetype2
 
@@ -25,14 +25,14 @@ INCS = -I${X11INC} -I${FREETYPEINC}
 LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
 
 # flags
-CPPFLAGS = -D_BSD_SOURCE -D_POSIX_C_SOURCE=2 -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+CPPFLAGS += -D_BSD_SOURCE -D_POSIX_C_SOURCE=2 -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
 #CFLAGS   = -g -std=c99 -pedantic -Wall -O0 ${INCS} ${CPPFLAGS}
-CFLAGS   = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os ${INCS} ${CPPFLAGS}
-LDFLAGS  = -s ${LIBS}
+CFLAGS   += -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os ${INCS} ${CPPFLAGS}
+LDFLAGS  += -s ${LIBS}
 
 # Solaris
 #CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
 #LDFLAGS = ${LIBS}
 
 # compiler and linker
-CC = cc
+CC ?= cc