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Herbert Valerio Riedel authored
This makes sure that `AC_USE_SYSTEM_EXTENSIONS` (which implies `AC_PROG_CC`) is called after the `AC_ARG_WITH([cc],,)` invocation, so that the proper CC setting is in scope. Otherwise this can break cross-compilation. This also needs to pull in a submodule update for `unix` This is a follow-up commit to 7af29da0 which hopefully fixes #11168
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