Compile and launch in MacOS

[danolivo]

I tried to use the extension in the MacOS Ventura 13.5 and found some issues:

1. User can't compile it as a part of the contrib - you provide the only PGXS make option.
2. LDFLAGS is overrided
3. Extension library couldn't be loaded because of the error:

CREATE EXTENSION pg_math;
ERROR:  could not load library "/Users/danolivo/PostgresPro/postgres/tmp_install/lib/pg_math.dylib": dlopen(/Users/danolivo/PostgresPro/postgres/tmp_install/lib/pg_math.dylib, 0x000A): symbol not found in flat namespace '_cblas_caxpy'

The first couple of issues I resolved by this changes of the makefile:
makefile.diff.zip
But the last one I still can't resolve. Maybe you already have experience with resolving it?