Issue #17777 has been updated by tdehnke (Tony Dehnke).


Newbie here,  I jsut ran into this today on my Mac running MacOS 11.2.3 (Intel) 

``` shell
tdehnke@Tonys-MacBook-Pro-15 12vBiz % rbenv install 2.6.7
Downloading ruby-2.6.7.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.7.tar.bz2
Installing ruby-2.6.7...
ruby-build: using readline from homebrew

BUILD FAILED (macOS 11.2.3 using ruby-build 20210420)

Inspect or clean up the working tree at /var/folders/r0/vw984xf56318dq54dzjk26wm0000gn/T/ruby-build.20210421115228.39383.OiFuid
Results logged to /var/folders/r0/vw984xf56318dq54dzjk26wm0000gn/T/ruby-build.20210421115228.39383.log

Last 10 log lines:
vm.c:2295:9: error: implicit declaration of function 'rb_native_mutex_destroy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        rb_native_mutex_destroy(&vm->waitpid_lock);
        ^
vm.c:2489:34: warning: expression does not compute the number of elements in this array; element type is 'const int', not 'VALUE' (aka 'unsigned long') [-Wsizeof-array-div]
                             sizeof(ec->machine.regs) / sizeof(VALUE));
                                    ~~~~~~~~~~~~~~~~  ^
vm.c:2489:34: note: place parentheses around the 'sizeof(VALUE)' expression to silence this warning
1 warning and 1 error generated.
make: *** [vm.o] Error 1
make: *** Waiting for unfinished jobs....
```


----------------------------------------
Bug #17777: 2.6.7 fails to build on macOS: implicit declaration of function 'rb_native_mutex_destroy' is invalid in C99
https://bugs.ruby-lang.org/issues/17777#change-91638

* Author: Eregon (Benoit Daloze)
* Status: Closed
* Priority: Normal
* ruby -v: 2.6.7
* Backport: 2.6: REQUIRED, 2.7: DONTNEED, 3.0: DONTNEED
----------------------------------------
https://github.com/ruby/ruby-builder/runs/2271346109?check_suite_focus=true#step:14:11253
```
vm.c:2295:9: error: implicit declaration of function 'rb_native_mutex_destroy' is invalid in C99 
```

There is also a warning below that might be worth solving:
```
vm.c:2489:34: warning: expression does not compute the number of elements in this array; element type is 'const int', not 'VALUE' (aka 'unsigned long') [-Wsizeof-array-div]
                             sizeof(ec->machine.regs) / sizeof(VALUE));
                                    ~~~~~~~~~~~~~~~~  ^
vm.c:2489:34: note: place parentheses around the 'sizeof(VALUE)' expression to silence this warning
```



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