Irix 6.2:- math.h: defines extern long double hypotl( long double ); i.e., onlyone 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 andespecially the return type is nowhere defined. The functions aredocumented in the man pages, though.