--- a/config.mk
+++ b/config.mk
@@ -4,30 +4,30 @@
 # Customize below to fit your system
 
 # paths
-PREFIX = /usr/local
+PREFIX ?= @TERMUX_PREFIX@
 MANPREFIX = ${PREFIX}/share/man
 
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
+X11INC = @TERMUX_PREFIX@/include
+X11LIB = @TERMUX_PREFIX@/lib
 
 # freetype
 FREETYPELIBS = -lfontconfig -lXft
-FREETYPEINC = /usr/include/freetype2
+FREETYPEINC = @TERMUX_PREFIX@/include/freetype2
 # OpenBSD (uncomment)
 #FREETYPEINC = ${X11INC}/freetype2
 
 # includes and libs
-INCS = -I. -I/usr/include -I$(X11INC) -I${FREETYPEINC}
-LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 ${FREETYPELIBS}
+INCS = -I. -I@TERMUX_PREFIX@/include -I$(X11INC) -I${FREETYPEINC}
+LIBS = -L@TERMUX_PREFIX@/lib -lc -L${X11LIB} -lX11 ${FREETYPELIBS}
 
 # flags
 CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE
-CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS = -s ${LIBS}
+CFLAGS += -std=c99 -pedantic -Wall ${INCS} ${CPPFLAGS}
+LDFLAGS += -s ${LIBS}
 
 # Solaris
 #CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
 #LDFLAGS = ${LIBS}
 
 # compiler and linker
-CC = cc
+CC ?= cc