Look at EXTERN.h:
$ find /Library/Developer/CommandLineTools -name EXTERN.h
/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Perl/5.30/darwin-thread-multi-2level/CORE/EXTERN.h
/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Perl/5.28/darwin-thread-multi-2level/CORE/EXTERN.h
/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE/EXTERN.h
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Perl/5.28/darwin-thread-multi-2level/CORE/EXTERN.h
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE/EXTERN.h
check your perl version:
$ perl -v
This is perl 5, version 18, subversion 4 (v5.18.4) built for darwin-thread-multi-2level
the right header is:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE/EXTERN.h
Use the correct OSX header so it work:
perl Makefile.PL --testpassword=s3kr1t --testhost=localhost --testport 3306 --testuser=test --libs="-L/usr/local/opt/openssl/lib -lssl -lcrypto -L/usr/local/lib -L/usr/local/Cellar/mysql/8.0.25_1/lib -lmysqlclient" --cflags='-I/usr/local/opt/openssl/include -I/usr/local/opt/zlib/include -I/usr/local/opt/zstd/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE -I/usr/local/Cellar/mysql/8.0.25_1/include/mysql'
PS, don't forget create mysql user 'test' with all privileges :-)
See details at:
UPGRADE for OSX 11.1 - Big Sur:
If I take the way above, I get at first the Error:
./dbdimp.h:20:10: fatal error: 'DBIXS.h' file not found
#include <DBIXS.h> /* installed by the DBI module */
The fix is, extend the perl Makefile.PL to:
perl Makefile.PL --testpassword=s3kr1t --testhost=localhost --testport 3306 --testuser=test --libs="-L/usr/local/opt/openssl/lib -lssl -lcrypto -L/usr/local/lib -L/usr/local/Cellar/mysql/8.0.25_1/lib -lmysqlclient" --cflags='-I/usr/local/opt/openssl/include -I/usr/local/opt/zlib/include -I/usr/local/opt/zstd/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Perl/5.30/darwin-thread-multi-2level/CORE -I/usr/local/Cellar/mysql/8.0.25_1/include/mysql -I/Library//Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Perl/Extras/5.30/darwin-thread-multi-2level/auto/DBI'
The next problem is:
make: *** No rule to make target `/System/Library/Perl/Extras/5.30/darwin-thread-multi-2level/auto/DBI/Driver_xst.h', needed by `mysql.xsi'. Stop.
Why this? The default installation of DBI on Big Sur is broken!
After downloading the current DBI archive DBI-1.643.tar.gz and reinstall DBI the DBD::mysql make run complete!
Now I must make a break :-) after 2 hours try and error!!!