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Many thanks Ray.. I followed your lead and downloaded libraylib.so

Then did :

gcc EX.c -fmax-errors=1000 -lGL -L./libraylib -L./libglfw -o a.exe

where libraylib.so and libglfw.so are in same folder as EX.c and

EX.c is identical to  your website example file for:

raylib [shapes] example - draw circle sector (with gui options)
*   This example has been created using raylib 2.5 (www.raylib.com

BUT I still get tons of 'undefined references' 

 ...What am I doing wrong ??

I recommend you ask on raylib Discord forum, it's easier to track the issue than here.