Is there a GSL implementation I can use with GCC 4.9.x?

Microsoft's GSL implementation is said to support GCC 5.1 - but does not specify support for other versions. Higher versions seem to be ok (anyway, 5.3.1 on my Debian Stretch) - but building the tests with GCC 4.9.3 fails.

• Can I use MS GSL anyway, somehow?
• If not, can I use some safe subset of it? (Probably not, I know)
• If not, isn't it a problem that only people with newer compilers can have a guidelines support libraries? Even though their older compilers support C++11 or even C++14?