-libht_a_SOURCES = utils.c mt.c log.c req.c proc.c mtio.c resp.c cf.c
-libht_a_CFLAGS = -fPIC
-libht_a_CPPFLAGS = -D_GNU_SOURCE
+libht_a_SOURCES = utils.c mt.c log.c req.c proc.c mtio.c resp.c \
+ cf.c bufio.c
+libht_a_CFLAGS = -fPIC
+if USE_EPOLL
+libht_a_SOURCES += mtio-epoll.c
+else
+if USE_KQUEUE
+libht_a_SOURCES += mtio-kqueue.c
+else
+libht_a_SOURCES += mtio-select.c
+endif
+endif