[CMake] CMake on Raspberry Pi

[Shawn G]

 Hi there, im having some troubles installing CMake on raspberry pi 3
running raspbian stretch.
I keep getting this error message when i run the command "sudo apt-get
install build-essential cmake pkg-config"
The error message:
" Reading package lists... Done
Building dependency tree
Reading state information... Done
Package CMake is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'cmake' has no installation candidate "

I've tried other installation methods like "pip install cmake" & "sudo
apt-get install -y cmake" but all to no avail. Could you guys help me out?
Is there a library i can extract from?

Thank you in advance.
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