Hi David > I'm curious why the macros > > AC_CONFIG_SUBDIRS > and > AC_SUBST > > take differing arguments to work? Because the arguments are of different type: AC_CONFIG_SUBDIRS gets a literal string which resolves to a list of paths, while AC_SUBST gets the name of an output variable name (@xxx@) to substitute with value of a shell variable of the same name when configure is run. > AC_CONFIG_SUBDIRS([${SRC_SUBDIRS}]) Using variables is not recommended since it prevents `./configure --help=recursive' from working correctly. See http://www.gnu.org/software/autoconf/manual/autoconf-2.62/html_node/Subdirectories.html Best regards Carsten _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf