[ITK-dev] Unsupported protocol error from ExternalData.cmake

Mon May 22 15:48:40 EDT 2017

Hi Jonathan,

I built from source on a brand new machine which may not have the SSL
> development headers installed.

This was probably the issue. With recent CMake, SSL headers should be
detected even when bootstrapping it.
For example, see
https://github.com/dockcross/dockcross/blob/f689116b3f4fd7d106e7bc3abbefb96254ce79bd/imagefiles/install-cmake.sh#L57-L91

The link above also provide a short test allowing to check if CMake support
https.

Jc

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