cmake issue

[wl0521]

I download OpenEXR by below command(
git clone --recurse-submodules https://github.com/AcademySoftwareFoundation/openexr.git)

when i cmake, the error message as below:

-- Selecting Windows SDK version 10.0.19041.0 to target Windows 10.0.19043.
Found python version: python39
CMake Error at CMakeLists.txt:52 (find_package):
By not providing "FindOpenEXR.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OpenEXR", but
CMake did not find one.

Could not find a package configuration file provided by "OpenEXR" with any
of the following names:

OpenEXRConfig.cmake
openexr-config.cmake

Add the installation prefix of "OpenEXR" to CMAKE_PREFIX_PATH or set
"OpenEXR_DIR" to a directory containing one of the above files. If
"OpenEXR" provides a separate development package or SDK, be sure it has
been installed.

I thought the reason which is I downloading the latest OpenEXR, and the new version don't have this specific file. However, when i search the older version, such as RB-2.3, RB-2.4, they also don't have those files.

SO, how to solve the problem?

[VicentChen]

According to the error message you provided I think you successfully compiled the OpenEXR, but failed to find the dependency.

There are 2 possible solutions:

1. Check whether you downloaded the OpenEXR repo in dependencies/Downloads. If not, you can copy it to that path, and then cmake the dependencies folder.
2. Set OpenEXR_ROOT in CMakeLists.txt, Line 51 (https://github.com/VicentChen/mitsuba/blob/cmake/CMakeLists.txt#L51) to your OpenEXR installation path.