From 1f845a3634ae34b79e1b4421b72f1a916c775cc6 Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Mon, 18 Mar 2019 22:45:44 +0000
Subject: [PATCH] Don't try to build libusb on FreeBSD

CMake Error at 3rdparty/libusb/libusb/os/CMakeLists.txt:90 (message):
  Unsupported platform FreeBSD.  Currently only support Windows, OSX, &
  Linux.
---
 3rdparty/CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/3rdparty/CMakeLists.txt b/3rdparty/CMakeLists.txt
index 905a86603e..9091c34ba1 100644
--- a/3rdparty/CMakeLists.txt
+++ b/3rdparty/CMakeLists.txt
@@ -87,7 +87,13 @@ endif()
 
 
 # libusb
-add_subdirectory(libusb EXCLUDE_FROM_ALL)
+if(CMAKE_SYSTEM MATCHES "DragonFly|FreeBSD")
+	# Always use system libusb as reference implementation isn't supported
+	add_library(usb-1.0-static INTERFACE)
+	target_link_libraries(usb-1.0-static INTERFACE usb)
+else()
+	add_subdirectory(libusb EXCLUDE_FROM_ALL)
+endif()
 
 
 # yaml-cpp