With clang 16, SingleSource/Benchmarks/Misc/mandel.c fails to compile on
FreeBSD, complaining that hypot() is not declared:
SingleSource/Benchmarks/Misc/mandel.c:38:13: error: call to undeclared library function 'hypot' with type 'double (double, double)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] if (hypot(__real__ z, __imag__ z) >= ESCAPE) ^
The hypot() function is declared in <math.h>, not <complex.h>, so
use the former. This also applies to at least OpenBSD.