[PATCH] stream_pvr: retain compatibility with older v4l2

Do not break systems which do not yet have VIDIOC_QUERY_EXT_CTRL.

Signed-off-by: Reza Arbab <[email protected]>
---
 configure           | 1 -
 stream/stream_pvr.c | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index b0324f7..63732a0 100755
--- a/configure
+++ b/configure
@@ -7762,7 +7762,6 @@ if test "$_pvr" = auto && test "$_tv_v4l2" = yes && linux ; then
 #include <linux/videodev2.h>
 int main(void) {
   struct v4l2_ext_controls ext;
-  struct v4l2_query_ext_ctrl qctrl;
   return ext.controls->value;
 }
 EOF
diff --git a/stream/stream_pvr.c b/stream/stream_pvr.c
index 5c5ff96..c6f6d18 100644
--- a/stream/stream_pvr.c
+++ b/stream/stream_pvr.c
@@ -1096,6 +1096,7 @@ static void
 add_v4l2_ext_control (struct v4l2_ext_controls *ctrls, struct pvr_t *pvr,
                       uint32_t id, int32_t value)
 {
+#ifdef VIDIOC_QUERY_EXT_CTRL
   struct v4l2_query_ext_ctrl qctrl = { .id = id };
 
   /* add only if the device supports this control */
@@ -1120,6 +1121,7 @@ add_v4l2_ext_control (struct v4l2_ext_controls *ctrls, struct pvr_t *pvr,
       return;
     }
   }
+#endif
 
   ctrls->controls[ctrls->count].id = id;
   ctrls->controls[ctrls->count].value = value;
-- 
2.5.0

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