+# make ... for both libusb and libsg
+#
+# make CONFIG_USE_LIBSG=0 ...
+# for just libusb
+#
PRG := st-util
OBJS = gdb-remote.o gdb-server.o
CFLAGS+=-g -Wall -Werror -std=gnu99 -I../src
-CFLAGS+=-DCONFIG_USE_LIBUSB
-CFLAGS+=-DCONFIG_USE_LIBSG
-LIBS := -lstlink -lusb-1.0 -lsgutils2
-LDFLAGS+=$(LIBS) -L..
+CFLAGS+=-DCONFIG_USE_LIBUSB=1
+CFLAGS+=-DCONFIG_USE_LIBSG=$(CONFIG_USE_LIBSG)
+LDFLAGS=-L.. -lstlink -lusb-1.0
+ifeq ($(CONFIG_USE_LIBSG),)
+CONFIG_USE_LIBSG=1
+endif
+
+ifneq ($(CONFIG_USE_LIBSG),0)
+LDFLAGS+=-lsgutils2
+endif
all: $(PRG)