... ~/lazarus-src/lazarus.app --args "--pcp=~/.laz_main"
There is also a daily FPC development snapshot for ARM64.
1. Move fpc-src to your home directory
2. Install with a script like:
#!/bin/sh
cd ~/fpc-src
xattr -drv com.apple.quarantine *
sudo make FPC=$PWD/ppca64 OPT="-ap -FD/Library/Developer/CommandLineTools/usr/bin -XR/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk" install
Adjust links in /usr/local/bin to point to 3.3.1 or choose compiler in Lazarus