The build failure issues are known from previous attempts to upgrade this formula to 6.6.5 (#61097 #64909) ..

The realpath issue may be fixed upstream ( http://cvs.savannah.gnu.org/viewvc/global/global/configure.ac?r1=1.204&r2=1.205&view=patch ) but I don't think anybody has tried to patch it in HB yet. So either we're waiting for someone to deal with that or for global to do another upstream release with the fix.

The actual configure error is (even with the patch):

configure:14276: checking whether POSIX.1-2008 realpath is equipped
configure:14293: clang -o conftest -g -O2   conftest.c  >&5
conftest.c:59:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
main(){ (void)realpath("/./tmp", (void *)0); return 0; }
^
conftest.c:59:15: error: implicit declaration of function 'realpath' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
main(){ (void)realpath("/./tmp", (void *)0); return 0; }
              ^
1 warning and 1 error generated.
configure:14293: $? = 1

Are you sure? The match is to configure.ac, so you need to regenerate configure if you want the patch to take effect (or just make the equivalent patch to configure itself, of course)

Got it, forgot to reconfigure. I always forget to do that ... I got it to build locally, let's see what happens on CI

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