+AC_CHECK_PROG([POD2MAN], [pod2man], [pod2man], [
+ AC_MSG_ERROR([pod2man tool from Perl is required])
+])
+
+dnl Substitute OCaml flags and packages.
+AC_SUBST([OCAMLFLAGS], ["-g -safe-string -warn-error CDEFLMPSUVYZX+52-3"])
+AC_SUBST([OCAMLPACKAGES], ["-package str,unix,threads -thread"])
+