Failed to find “GLESv2” when compiling OpenCV?

Question

I'm having trouble compiling opencv 2.4.7 with cmake, I get a Failed to find "GLESv2" error:

(hal)pi@raspberrypi ~/OpenCV/opencv-2.4.7/build $ cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON -D BUILD_EXAMPLES=ON ..
-- Detected version of GNU GCC: 46 (406)

-- Found OpenEXR: /usr/lib/libIlmImf.so
CMake Error at /usr/lib/arm-linux-gnueabihf/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:31 (message):
  Failed to find "GLESv2" in "/opt/vc/lib".
Call Stack (most recent call first):
  /usr/lib/arm-linux-gnueabihf/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:64 (_qt5gui_find_extra_libs)
  /usr/lib/arm-linux-gnueabihf/cmake/Qt5Gui/Qt5GuiConfig.cmake:137 (include)
  cmake/OpenCVFindLibsGUI.cmake:19 (find_package)
  CMakeLists.txt:421 (include)

-- Configuring incomplete, errors occurred!

However, I see libGLESv2.so in the /opt/vc/lib directory:

(hal)pi@raspberrypi ~/OpenCV/opencv-2.4.7/build $ cd /opt/vc/lib
(hal)pi@raspberrypi /opt/vc/lib $ ls
libbcm_host.so   libEGL.so        libGLESv1_CM.so  libGLESv2_static.a  libkhrn_static.a  libmmal.so       libmmal_vc_client.so  libOpenVG.so        libvchiq_arm.so  libvcos.so            libwayland-egl.so
libdebug_sym.so  libEGL_static.a  libGLESv2.so     libkhrn_client.a    libmmal_core.so   libmmal_util.so  libopenmaxil.so       libvcfiled_check.a  libvchostif.a    libvmcs_rpc_client.a  libWFC.so

I'm not sure what's going on if the GLESv2 library file seems to be there.

Answer 1

I was able to run the Cmake command by editing the /usr/lib/arm-linux-gnueabihf/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake file and adding

set(CMAKE_LIBRARY_PATH /opt/vc/lib)
set(_qt5gui_OPENGL_INCLUDE_DIR /opt/vc/include)

at the start of the file.