--- a/lgmon3/src/Makefile.am
+++ b/lgmon3/src/Makefile.am
@@ -6,6 +6,6 @@ transform =
 
 cnijlgmon3_SOURCES = cnijcomif.c cnijifusb.c cnijlgmon3.c cnijifnet.c keytext.c cnijifnet2.c cnijutil.c
 
-CFLAGS = -O2 -Wall -I/usr/include/libusb-1.0 -I./common @XML2_CFLAGS@
+CFLAGS = -O2 -Wall `pkg-config --cflags libusb-1.0` -I./common @XML2_CFLAGS@
 
 cnijlgmon3_LDADD = -ldl -lusb-1.0 -lcnnet2 -lxml2 -lcnbpcnclapicom2 -lcnbpnet30
