-CHECK_FUNCTION_EXISTS(regcomp HAVE_REGCOMP)
-CHECK_FUNCTION_EXISTS(iswalnum HAVE_ISWALNUM)
-CHECK_FUNCTION_EXISTS(iswalpha HAVE_ISWALPHA)
-CHECK_FUNCTION_EXISTS(iswcntrl HAVE_ISWCNTRL)
-CHECK_FUNCTION_EXISTS(iswdigit HAVE_ISWDIGIT)
-CHECK_FUNCTION_EXISTS(iswgraph HAVE_ISWGRAPH)
-CHECK_FUNCTION_EXISTS(iswlower HAVE_ISWLOWER)
-CHECK_FUNCTION_EXISTS(iswprint HAVE_ISWPRINT)
-CHECK_FUNCTION_EXISTS(iswpunct HAVE_ISWPUNCT)
-CHECK_FUNCTION_EXISTS(iswspace HAVE_ISWSPACE)
-CHECK_FUNCTION_EXISTS(iswupper HAVE_ISWUPPER)
-CHECK_FUNCTION_EXISTS(iswxdigit HAVE_ISWXDIGIT)
-CHECK_FUNCTION_EXISTS(towupper HAVE_TOWUPPER)
-CHECK_FUNCTION_EXISTS(towlower HAVE_TOWLOWER)