configure.ac: Use pkg-config to find libusb on *freebsd

Author: z3ntu

configure.ac

@@ -92,9 +92,10 @@ case $host in
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	LIBS="${LIBS}"
-	AC_CHECK_LIB([usb], [libusb_init], [LIBS_LIBUSB_PRIVATE="${LIBS_LIBUSB_PRIVATE} -lusb"], [hidapi_lib_error libusb])
+	PKG_CHECK_MODULES([libusb], [libusb-1.0 >= 1.0.9], true, [hidapi_lib_error libusb-1.0])
+	LIBS_LIBUSB_PRIVATE="${LIBS_LIBUSB_PRIVATE} $libusb_LIBS"
+	CFLAGS_LIBUSB="${CFLAGS_LIBUSB} $libusb_CFLAGS"
 	AC_CHECK_LIB([iconv], [iconv_open], [LIBS_LIBUSB_PRIVATE="${LIBS_LIBUSB_PRIVATE} -liconv"], [hidapi_lib_error libiconv])
-	echo libs_priv: $LIBS_LIBUSB_PRIVATE
 	;;
 *-kfreebsd*)
 	AC_MSG_RESULT([ (kFreeBSD back-end)])
@@ -104,8 +105,9 @@ case $host in
 	os="kfreebsd"
 	threads="pthreads"
 
-	AC_CHECK_LIB([usb], [libusb_init], [LIBS_LIBUSB_PRIVATE="${LIBS_LIBUSB_PRIVATE} -lusb"], [hidapi_lib_error libusb])
-	echo libs_priv: $LIBS_LIBUSB_PRIVATE
+	PKG_CHECK_MODULES([libusb], [libusb-1.0 >= 1.0.9], true, [hidapi_lib_error libusb-1.0])
+	LIBS_LIBUSB_PRIVATE="${LIBS_LIBUSB_PRIVATE} $libusb_LIBS"
+	CFLAGS_LIBUSB="${CFLAGS_LIBUSB} $libusb_CFLAGS"
 	;;
 *-mingw*)
 	AC_MSG_RESULT([ (Windows back-end, using MinGW)])