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Detail 4: Finding Matlab
The FindMatlab.cmake distributed with cmake by KitWare is woefully inadequate at finding any recent releases of Matlab. So it's time to write a new one. With a bit of crowd-sourcing I've been able to come up with the default install paths of Matlab on different architectures (in order of likelihood)
Linux: /usr/local /opt/local /usr /opt
Apple: /Applications /usr/local /opt/local /usr /opt
Windows: C:\Program Files C:\Program Files (x86)
In the case of Windows machines, assuming everything is in C: is a baaaad idea, so there are (gulp) recommended methods of hunting through the registry for paths:
execute_process(COMMAND reg query HKLM\\SOFTWARE\\MathWorks\\MATLAB /f * /k)
In the case of Unix derivatives, grep and regex are your friends.
OpenCV eschews the regular package finding convention of find_package(<package>) which locates a Find<package>.cmake file on the CMAKE_MODULE_PATH, in favour of having all the packages called OpenCV[Find/Detect]<package>.cmake and then simply including them in the root CMakeLists.txt as include(cmake/OpenCV[Find/Deteect]<package>.cmake). This is for one very simple and deliberate reason:
They want to make sure their own cmake files are loaded and not other ones on the system