Both 32-bit and 64-bit versions should be built for maximum compatiliby before deployment. See https://dfir-orc.github.io for more details about deployment and configuration.
In a prompt like Developer Command Prompt for VS 2019 (prefer to avoid using cmd.exe):
The -T v141_xp option will allow compatibility with Windows XP SP2 and later, it can safely be removed if this is not required.
The ORC_BUILD_VCPKG=ON option will build vcpkg packages in 'external/vcpkg' subdirectory.
Options
Using default options is recommended with the exception of ORC_BUILD_VCPKG which should be set to ON so dependencies will be built automatically using vcpkg.
[2] The xmllite.dll is native after patched Windows XP SP2
Note: Some combinations may be irrelevant.
Build vcpkg dependencies manually
See top CMakeLists.txt for a complete list of the
dependencies to install. Building mainstream vcpkg may not work as some
packages have custom patches. The VERSION.txt contains the reference commit from official vcpkg repository.
cd external/vcpkg
bootstrap-vcpkg.bat
vcpkg --vcpkg-root . install fmt:x64-windows-static ...
Acknowledgments
DFIR ORC is disclosing Microsoft source code with Microsoft's permission.