diff --git a/extra/opencv/PKGBUILD b/extra/opencv/PKGBUILD
index 82c3135c9..5c6d39da6 100644
--- a/extra/opencv/PKGBUILD
+++ b/extra/opencv/PKGBUILD
@@ -6,8 +6,8 @@
 
 pkgbase=opencv
 pkgname=(opencv opencv-samples)
-pkgver=3.4.4
-pkgrel=1
+pkgver=4.0.0
+pkgrel=4
 pkgdesc="Open Source Computer Vision Library"
 arch=(x86_64)
 license=(BSD)
@@ -22,8 +22,8 @@ optdepends=('opencv-samples: samples'
             'python-numpy: Python interface')
 source=("$pkgbase-$pkgver.tar.gz::https://github.com/opencv/opencv/archive/$pkgver.zip"
         "opencv_contrib-$pkgver.tar.gz::https://github.com/opencv/opencv_contrib/archive/$pkgver.tar.gz")
-sha256sums=('b5755384cbadf67f55838c6cfd9ae1aad0ebad2c7cfe4c1174417c80d2ed15a9'
-            '765446d994713363554978d1da447fef77a2cdf9e38742f0a98b13b92652626d')
+sha256sums=('86fd08fc02893e05e2944fa7b0daa7d02643232450f020b475e1b2f24587b99a'
+            '4fb0681414df4baedce6e3f4a01318d6f4fcde6ee14854d761fd4e397a397763')
 
 prepare() {
   mkdir -p build
@@ -32,6 +32,7 @@ prepare() {
 build() {
   cd build
   # cmake's FindLAPACK doesn't add cblas to LAPACK_LIBRARIES, so we need to specify them manually
+  _pythonpath=`python -c "from sysconfig import get_path; print(get_path('platlib'))"`
   cmake ../$pkgname-$pkgver \
     -DWITH_OPENCL=ON \
     -DWITH_OPENGL=ON \
@@ -46,31 +47,31 @@ build() {
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DCMAKE_INSTALL_LIBDIR=lib \
     -DOPENCV_EXTRA_MODULES_PATH="$srcdir/opencv_contrib-$pkgver/modules" \
+    -DOPENCV_SKIP_PYTHON_LOADER=ON \
+    -DOPENCV_PYTHON3_INSTALL_PATH=$_pythonpath \
     -DLAPACK_LIBRARIES="/usr/lib/liblapack.so;/usr/lib/libblas.so;/usr/lib/libcblas.so" \
     -DLAPACK_CBLAS_H="/usr/include/cblas.h" \
-    -DLAPACK_LAPACKE_H="/usr/include/lapacke.h"
+    -DLAPACK_LAPACKE_H="/usr/include/lapacke.h" \
+    -DOPENCV_GENERATE_PKGCONFIG=ON
   make
 }
 
 package_opencv() {
-  options=(staticlibs)
-
   cd build
   make DESTDIR="$pkgdir" install
 
   # install license file
   install -Dm644 "$srcdir"/$pkgname-$pkgver/LICENSE -t "$pkgdir"/usr/share/licenses/$pkgname
 
-  # install python bindings
-  cd python_loader
-  python setup.py install --root="$pkgdir"
-  rm -r "$pkgdir"/usr/python
-
-  cd "$pkgdir"/usr/share
-
   # separate samples package
-  mv OpenCV/samples "$srcdir/$pkgname-samples"
-  mv OpenCV $pkgname # otherwise folder naming is inconsistent
+  cd "$pkgdir"/usr/share
+  mv opencv4/samples "$srcdir"/$pkgname-samples
+
+  # install missing headers https://github.com/opencv/opencv/issues/13201
+  for _module in imgcodecs videoio photo; do
+    cp -r "$srcdir"/$pkgname-$pkgver/modules/$_module/include/opencv2/$_module/legacy \
+      "$pkgdir"/usr/include/opencv4/opencv2/$_module
+  done
 }
 
 package_opencv-samples() {
diff --git a/extra/opencv/opencv-legacy-headers.patch b/extra/opencv/opencv-legacy-headers.patch
new file mode 100644
index 000000000..3a6c8db55
--- /dev/null
+++ b/extra/opencv/opencv-legacy-headers.patch
@@ -0,0 +1,12 @@
+diff --git a/modules/imgcodecs/CMakeLists.txt b/modules/imgcodecs/CMakeLists.txt
+index d771224d4..dc9587927 100644
+--- a/modules/imgcodecs/CMakeLists.txt
++++ b/modules/imgcodecs/CMakeLists.txt
+@@ -102,6 +102,7 @@ file(GLOB imgcodecs_ext_hdrs
+      "${CMAKE_CURRENT_LIST_DIR}/include/opencv2/*.hpp"
+      "${CMAKE_CURRENT_LIST_DIR}/include/opencv2/${name}/*.hpp"
+      "${CMAKE_CURRENT_LIST_DIR}/include/opencv2/${name}/*.h"
++     "${CMAKE_CURRENT_LIST_DIR}/include/opencv2/${name}/*/*.h"
+      )
+ 
+ if(IOS)