diff --git a/extra/opencv/PKGBUILD b/extra/opencv/PKGBUILD
index d7bcd8fac..70dbd3ec6 100644
--- a/extra/opencv/PKGBUILD
+++ b/extra/opencv/PKGBUILD
@@ -9,7 +9,7 @@
 pkgbase=opencv
 pkgname=('opencv' 'opencv-samples')
 pkgver=3.4.1
-pkgrel=2
+pkgrel=2.1
 pkgdesc="Open Source Computer Vision Library"
 arch=('x86_64')
 license=('BSD')
@@ -17,8 +17,9 @@ url="http://opencv.org/"
 depends=('openexr' 'xine-lib' 'libdc1394' 'cblas' 'lapack' 'libgphoto2' 'jasper' 'protobuf')
 depends_armv7h=('intel-tbb')
 depends_aarch64=('intel-tbb')
-makedepends=('cmake' 'python-numpy' 'python2-numpy' 'mesa' 'eigen' 'hdf5' 'lapacke')
+makedepends=('cmake' 'python-numpy' 'python2-numpy' 'mesa' 'eigen' 'hdf5' 'lapacke' 'gtkglext')
 optdepends=('opencv-samples'
+            'gtkglext: for the HighGUI module'
             'hdf5: support for HDF5 format'
             'opencl-icd-loader: For coding with OpenCL'
             'python-numpy: Python 3 interface'