Installation of PHP-7.3 with phpbrew on OS X 10.15.7 (Catalina):
Error: Make failed: The last 5 lines in the log file: /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/dirent.h:110:1: note: 'readdir_r' declared here
int readdir_r(DIR *, struct dirent *, struct dirent **) __DARWIN_INODE64(readdir_r);
^
1 error generated.
make: *** [main/reentrancy.lo] Error 1
Downgrade the Command Line Tools to the version for Xcode 11.5 (or 11.x). You can download them here: https://developer.apple.com/download/more/
(I also installed Xcode 11.7 but that won't fix the issue)
I've found this solution here: https://github.com/Homebrew/homebrew-core/pull/61820