Irix 6.2:
- math.h: defines extern long double hypotl( long double ); i.e., only
one argument. They've fixed this in 6.3.
DES OSF 3.2 & 4.0:
- libm define sincos, sincosf, and sincosl but there are no prototypes and
especially the return type is nowhere defined. The functions are
documented in the man pages, though.