Rather than always asserting our version of getopt(2), only do so if it lacks certain features. Some of the configure.ac changes have come from openssh-portable.

When checking for ncurses, don't clobber previous checks for libpanel.

When looking for base64 functions, check -lresolv and/or -lnetwork, and only build those in compat if required. Some of the detection code was modified from tmux's configure.ac script.

Some code in compat/ has #defines which were not being checked for in configure.ac, which could have lead to compilation failures were those files to be included on systems which needed them. In doing so, we can now remove libmd and libcrypto as these are no longer needed.

Don't use a custom variable when the header checks for these are already available. From Christian "naddy" Weisgerber.

Set LIBS to the empty string so that only the specific dependencies are included where needed, rather than relying on autotools to do this for us. This will make splitting out got into different subprojects easier, as well as allow for multi-packing on those systems which support it.

Rather than assume all dependencies are required for all programs, split them out. This will make packaging easier, as well as splitting the code to use subprojects. Note that due to the use of config.h semantics, in most cases the got_compat.h header file is now at the top of the .c file it is included in, so that it can handle the system header inclusion properly.

So that the command-line flags to CC don't get drowned out with copious -D flags, move this detection to config.h instead. Note that to reduce the code churn, the existing include/got_compat.h header file has been renamed, and the generated file replaces it, but with the contents of the original header file included. Eventually, we might want to move some od the logic in include/got_compat2.h into AH_VERBATIM() blocks, but for now, this is a good compromise.

found_libbsd isn't used any more.

Fixes openbsd.

Original patch from Omar Polo. Tweak by me.

Add compatability support for sha2 for systems which don't natively have it. This has been stolen from OpenBSD. Thanks!

Don't rely on AC_RUN_IFELSE as this breaks cross-compilation (voidlinux). Although this is better replaced with AC_CHECK_DECL. In template/ include checking for libbsd.

Simply the SHA detection by not predicating on libcrypto, but instead checking individual header files.

Some systems have bison (yacc) in a non-standard location. Since Autotolls is setting the YACC environment variable based on the AC_PROG_YACC macro, let the user override this if YACC is set in the environment already. This issue was found by a user of MacPorts. I did not get any feedback from them as to whether this worked, but my own testing indicates this should work.

Move template into its own subproject as it's only needed at compile-time and shouldn't be installed. This needs compiling with the host compiler which is configurable via HOSTCC and HOSTCLFAG environment variables. This diff largely from op@ but additional tweaking from myself.

Despite -portable existing to make the codebase compile on platforms other than OpenBSD, there's nothing wrong with making -portable still compile on that platform as well.

When not using pkg-config on those systems where it isn't installed, libpanelw should be checked within ncursesw as well -- such is the case on OpenBSD for example.

This updates -portable's gotwebd instance to make use of the new templating engine.

Cosmetic change only. No functional changes expected. Via Anna (cybertailor) Vyalkova

Needed for stringent checks on Gentoo. Bug 879825. Via Anna (cybertailor) Vyalkova.

When checking for sys/tree.h on non-BSD systems, either it will be in the standard include path (such as on MacOS), or it won't be found, until libbsd is overlayed. In cases where we want to find sys/tree.h via libbsd, perform a AC_CHECK_DECL for a known #define in sys/tree.h -- which will still find sys/tree.h in either location, or uses compat/tree.h in all other cases.

libbsd as a library was created some years back to pull together BSD-specific functionality to be used on non-BSD systems. When it was in its infancy, and not being widely adopted across non-BSD systems, there was often a need to carry around compat versions of sys/{queue,tree}.h This is no longer the case -- and the compat code for this has never worked on systems which lacked a compatible sys/tree.h header anyway, so remove this, and let the user know that libbsd is needed. A few people have mentioned this to me.