Didier Verna <didier(a)xemacs.org&gt; writes: > | /* For use in #include statements. > | You can't use macros directly within the <> of a #include statement. > | The multiply nested macros are necessary to make old gcc's happy. > | However, those nested macros are too much for AIX xlc to deal with. */ > | #if defined(_AIX) && !defined(__GNUC__) > | #define ATHENA_INCLUDE(header_file) <ATHENA_H_PATH/header_file> > | #else ... > * Each time a new inclusion macro needs to be written, you have to > redo the AIX test. I concede that this is not very satisfactory. That kills it IMO. AIX /per se/ is of course not the issue. The issue is that only God knows how many more compilers have exactly the same problem. These #ifdef's scattered through code might only increase. Idea: maybe we should design a configure test to test which kind of configure glue the user's preprocessor likes. Then our config.h.in could say something like: #define ATHENA_INCLUDE ＠INCLUDE_GLUE＠(...)