try to enable v4l (which should be on by default...)

Author: skvark

travis/build-wheels.sh

@@ -68,7 +68,8 @@ if [[ $PYTHON_VERSION == 2* ]] && [[ $ENABLE_CONTRIB == 0 ]]; then
     -DWITH_JPEG=ON \
     -DBUILD_JPEG=OFF \
     -DJPEG_INCLUDE_DIR="$JPEG_INCLUDE_DIR" \
-    -DJPEG_LIBRARY="$JPEG_LIBRARY"
+    -DJPEG_LIBRARY="$JPEG_LIBRARY" \
+    -DWITH_V4L=ON
 
 fi
 
@@ -88,7 +89,8 @@ if [[ $PYTHON_VERSION == 3* ]] && [[ $ENABLE_CONTRIB == 0 ]]; then
     -DWITH_JPEG=ON \
     -DBUILD_JPEG=OFF \
     -DJPEG_INCLUDE_DIR="$JPEG_INCLUDE_DIR" \
-    -DJPEG_LIBRARY="$JPEG_LIBRARY"
+    -DJPEG_LIBRARY="$JPEG_LIBRARY" \
+    -DWITH_V4L=ON
 
 fi
 
@@ -108,7 +110,8 @@ if [[ $PYTHON_VERSION == 2* ]] && [[ $ENABLE_CONTRIB == 1 ]]; then
     -DWITH_JPEG=ON \
     -DBUILD_JPEG=OFF \
     -DJPEG_INCLUDE_DIR="$JPEG_INCLUDE_DIR" \
-    -DJPEG_LIBRARY="$JPEG_LIBRARY"
+    -DJPEG_LIBRARY="$JPEG_LIBRARY" \
+     -DWITH_V4L=ON
 
 fi
 
@@ -128,7 +131,8 @@ if [[ $PYTHON_VERSION == 3* ]] && [[ $ENABLE_CONTRIB == 1 ]]; then
     -DWITH_JPEG=ON \
     -DBUILD_JPEG=OFF \
     -DJPEG_INCLUDE_DIR="$JPEG_INCLUDE_DIR" \
-    -DJPEG_LIBRARY="$JPEG_LIBRARY"
+    -DJPEG_LIBRARY="$JPEG_LIBRARY" \
+    -DWITH_V4L=ON
 
 fi