isinf is a function / macro which returns wether or not a float is
positive
infinite or negative infinite. I think it is a standard C function. Maybe solaris declares it in some header that needs to be included, like math.h?
I have logged for this bug: http://bugs.winehq.org/show_bug.cgi?id=12008
Not sure where to find it exactly. But isinf seems to be defined by ISO 99 (not by standard C).
Regards,
Petr