--- a/config.mk
+++ b/config.mk
@@ -4,11 +4,11 @@
 # 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
 
 # Xinerama, comment if you don't want it
 XINERAMALIBS  = -lXinerama
@@ -16,7 +16,7 @@
 
 # freetype
 FREETYPELIBS = -lfontconfig -lXft
-FREETYPEINC = /usr/include/freetype2
+FREETYPEINC = @TERMUX_PREFIX@/include/freetype2
 # OpenBSD (uncomment)
 #FREETYPEINC = ${X11INC}/freetype2
 
@@ -25,14 +25,14 @@
 LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
 
 # flags
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+CPPFLAGS += -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
 #CFLAGS   = -g -std=c99 -pedantic -Wall -O0 ${INCS} ${CPPFLAGS}
-CFLAGS   = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os ${INCS} ${CPPFLAGS}
-LDFLAGS  = ${LIBS}
+CFLAGS   += -std=c99 -pedantic -Wall -Wno-deprecated-declarations ${INCS} ${CPPFLAGS}
+LDFLAGS  += ${LIBS}
 
 # Solaris
 #CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
 #LDFLAGS = ${LIBS}
 
 # compiler and linker
-CC = cc
+CC ?= cc