Allow system vrgstream.h override

configure.ac

@@ -3188,6 +3188,10 @@ AC_ARG_ENABLE(vrg,
 AC_CHECK_HEADER(vrgstream.h, FOUND_VRG_H=yes, FOUND_VRG_H=no)
 AC_CHECK_LIB(vrgstream, vrgStreamInit,  FOUND_VRG_L=yes, FOUND_VRG_L=no)
 
+if test $FOUND_VRG_H = yes; then
+        AC_DEFINE([HAVE_VRG_H], [1], [We can use vrgstream.h])
+fi
+
 if test $vrg_req != no -a $FOUND_VRG_H = yes -a $FOUND_VRG_L = yes
 then
         LIBS="$LIBS -lvrgstream"

src/rtp/rtp_callback.c

@@ -74,8 +74,14 @@
 #include "rtp/pbuf.h"
 #include "rtp/rtp_callback.h"
 #include "tfrc.h"
+
+// substitute RGBA not to collide with UG RGBA
 #define RGBA VR_RGBA
-#include "vrgstream.h"
+#ifdef HAVE_VRG_H
+#include <vrgstream.h>
+#else
+#include "vrgstream-fallback.h"
+#endif
 #undef RGBA
 
 extern char *frame;

src/video_capture/shm.c

@@ -55,8 +55,14 @@
 #include "video.h"
 #include "video_capture.h"
 #include "video_capture/shm.h"
+
+// substitute RGBA not to collide with UG RGBA
 #define RGBA VR_RGBA
-#include "vrgstream.h"
+#ifdef HAVE_VRG_H
+#include <vrgstream.h>
+#else
+#include "vrgstream-fallback.h"
+#endif
 #undef RGBA
 
 #define MAX_BUF_LEN (7680 * 2160 / 3 * 2)