Yesterday I got all the way through a major rewrite of AC_PROG_LEX before realizing it didn't actually solve any of the problems with "Software Generation Utilities (SGU) Solaris-ELF (4.0)" lex (as shipped by OmniOS and I presume also OpenIndiana). I think the changes I made might still be worth doing, but they're quite invasive and in particular may change the behavior of AC_PROG_LEX's compatibility mode undesirably. Therefore, I do not plan to include them in Autoconf 2.72. Instead, I pushed all the changes to a new branch in savannah: https://git.savannah.gnu.org/cgit/autoconf.git/log/?h=zack/ac-prog-lex-rewrite I'd like to land these changes early in the 2.73 cycle, so I invite testing now. Testing of the compat mode, and testing of interactions with Automake, are particularly helpful. Testing with Sun lex is *not* helpful at this time; the problems discussed in the thread starting at https://lists.gnu.org/archive/html/bug-autoconf/2023-12/msg00005.html have not been fixed. However, testing of other non-Flex implementations of lex *is* helpful. I may make further changes on this branch; see the TODO list in the commit message. This message is going out to a bunch of people who reported difficulties with AC_PROG_LEX in the past, as well as to autoconf@xxxxxxx. If you have not previously tried to test a git checkout of Autoconf, see 'README-hacking' (*not* 'HACKING') at top level of the source tree for instructions. zw
