/*
 * Prototypes for complex functions
 */
#ifdef HAVE_COMPLEX_FUNCS

void f_Igamma(union argument *arg);
void f_LambertW(union argument *arg);
void f_lnGamma(union argument *arg);
void f_Sign(union argument *arg);
void f_zeta(union argument *arg);

double igamma(double a, double z);

#endif