Why can't Compiler Explorer find <math.h>?

Question

I am trying to compile a C module that includes math.h on Compiler Explorer, targeted at the ARM architecture. The compiler complains that it cannot find math.h regardless of the armclang version I am using.

How can I get CE to find and include math.h?

#include <math.h>

<source>:1:10: fatal error: 'math.h' file not found
#include <math.h>
         ^~~~~~~~
1 error generated.
Compiler returned: 1