[CMake] How to build cmake to have http support?

[Cedric Doucet]

Hello, 

I would like to build cmake on a cluster where I don't have any administrator privilege. 
Since I use the ExternalProject_Add command in my configuration script, I need to have https support with curl. 
But when one build cmake without specific option, it does not support https. 

I managed to compile cmake such that it support https by the past, but I can't remember how I did it. 
I remember I installed openssl and pass some flags to cmake. 

Could anyone remember me how to do it? 
Or, is it possible to recover passed flags from a local installation of cmake? 

Thank you! 

Cédric 

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