+
+ # If idna.h can't be found, check to see if it was installed under
+ # /usr/include/idn (OpenSolaris, at least, places it there).
+ # Check for idn-int.h in that case, because idna.h won't find
+ # idn-int.h until we've decided to add -I/usr/include/idn.
+ AC_CHECK_HEADER(idna.h, ,
+ [AC_CHECK_HEADER(idn/idn-int.h,
+ [CPPFLAGS="${CPPFLAGS} -I/usr/include/idn"],
+ [iri=no])]
+ )
+
+ if test "X$iri" != "Xno"; then