diff --git a/cinelerra-5.1/opencv_build b/cinelerra-5.1/opencv_build
index fd029027..20908747 100644
--- a/cinelerra-5.1/opencv_build
+++ b/cinelerra-5.1/opencv_build
@@ -49,6 +49,7 @@ jobs:=-j$(shell echo $$(($(cpus) + $(cpus)/2 +2)))
 #opencv4 breaks SIFT/SURF findobj
 CFLAGS += -I$(opencv_prefix)/include/opencv4
 CFLAGS += -I$(opencv_prefix)/include
+CFLAGS += -std=c++11
 
 ifeq ($(src),git)
 $(opencv).src:
@@ -81,6 +82,9 @@ $(opencv)/build: $(opencv).src
   -DINSTALL_C_EXAMPLES=OFF \
   -DINSTALL_PYTHON_EXAMPLES=OFF \
   -DBUILD_EXAMPLES=OFF .. \
+  -DBUILD_PERF_TESTS=OFF \
+  -DBUILD_TESTS=OFF \
+  -DBUILD_opencv_apps=OFF \
   -DBUILD_opencv_python3=no \
   -DCMAKE_INSTALL_PREFIX=/usr/local \
   -DOPENCV_EXTRA_MODULES_PATH="$(opencv)_contrib/modules/"