Do not link with Firebird framework if it does not exist on macOS.
This (and possibly combined with https://github.com/Perl-Toolchain-Gang/ExtUtils-MakeMaker/pull/403) should fix issue #51, but I am not able to test it since I am using Apple M1 chip and the Firebird libraries for version 3 are built for macOS-x86_64.
Do not link with Firebird framework if it does not exist on macOS. This (and possibly combined with https://github.com/Perl-Toolchain-Gang/ExtUtils-MakeMaker/pull/403) should fix issue #51, but I am not able to test it since I am using Apple M1 chip and the Firebird libraries for version 3 are built for macOS-x86_64.