ctype funcitons

From building PHP on a MacOSX machine: ctype.c: In function `zif_ctype_alnum': ctype.c:126: `isalnum' undeclared (first use in this function) ctype.c:126: (Each undeclared identifier is reported only once ctype.c:126: for each function it appears in.) ctype.c: In function `zif_ctype_alpha': ctype.c:143: `isalpha' undeclared (first use in this function) ctype.c: In function `zif_ctype_cntrl': ctype.c:160: `iscntrl' undeclared (first use in this function) ctype.c: In function `zif_ctype_digit': ctype.c:177: `isdigit' undeclared (first use in this function) ctype.c: In function `zif_ctype_lower': ctype.c:194: `islower' undeclared (first use in this function) ctype.c: In function `zif_ctype_graph': ctype.c:211: `isgraph' undeclared (first use in this function) ctype.c: In function `zif_ctype_print': ctype.c:228: `isprint' undeclared (first use in this function) ctype.c: In function `zif_ctype_punct': ctype.c:245: `ispunct' undeclared (first use in this function) ctype.c: In function `zif_ctype_space': ctype.c:262: `isspace' undeclared (first use in this function) ctype.c: In function `zif_ctype_upper': ctype.c:279: `isupper' undeclared (first use in this function) ctype.c: In function `zif_ctype_xdigit': ctype.c:296: `isxdigit' undeclared (first use in this function) >---------------------------------------------------------------< Dan Kalowsky "Tonight I think I'll walk alone. http://www.deadmime.org/~dank I'll find soul as I go home." dank@deadmime.org - "Temptation", New Order