st/prober: Guard libudev usage

src/xrt/state_trackers/prober/CMakeLists.txt

@@ -7,24 +7,34 @@ include_directories(
 	${CMAKE_CURRENT_SOURCE_DIR}/../../../external
 	)
 
+set(PROBER_INCLUDES)
+
 set(PROBER_SOURCE_FILES
 	p_auto_wrap.c
 	p_documentation.h
 	p_dump.c
 	p_prober.c
 	p_prober.h
-	p_udev.c
 	)
 
+# Add libudev
+if(BUILD_WITH_LIBUDEV)
+	list(APPEND PROBER_SOURCE_FILES
+		p_udev.c
+		)
+	list(APPEND PROBER_INCLUDES
+		${LIBUDEV_INCLUDES}
+		)
+endif()
+
 # Use OBJECT to not create a archive, since it just gets in the way.
 add_library(st_prober OBJECT ${PROBER_SOURCE_FILES})
 
 target_include_directories(st_prober
 	PRIVATE
+	${PROBER_INCLUDES}
 	${LIBUSB_INCLUDES}
 	${LIBUVC_INCLUDES}
-	${FFMPEG_INCLUDES}
-	${OPENCV_INCLUDES}
 	)
 
 set_property(TARGET st_prober PROPERTY POSITION_INDEPENDENT_CODE ON)

src/xrt/state_trackers/prober/p_prober.c

@@ -465,11 +465,13 @@ probe(struct xrt_prober* xp)
 		return -1;
 	}
 
+#ifdef XRT_HAVE_LIBUDEV
 	ret = p_udev_probe(p);
 	if (ret != 0) {
 		P_ERROR(p, "Failed to enumerate udev devices\n");
 		return -1;
 	}
+#endif
 
 	return 0;
 }

src/xrt/state_trackers/prober/p_udev.c

@@ -7,8 +7,6 @@
  * @ingroup st_prober
  */
 
-#ifdef XRT_HAVE_LIBUDEV
-
 #include "util/u_misc.h"
 #include "p_prober.h"
 
@@ -341,5 +339,3 @@ p_udev_get_and_parse_uevent(struct udev_device* raw_dev,
 		return -1;
 	}
 }
-
-#endif