Install on Sonoma

Fresh install of macOS Sonoma 14.2.1 on MacBookPro M1 Max

`./build.sh` reports:

```
…
checking for ranlib... /usr/bin/ranlib
checking for gsed... no
configure: error: gsed must be available to build this library
…

I then did `brew install gsed` and got further:

```
…
checking for PTHREAD_PRIO_INHERIT... yes
checking for asm/page.h... no
checking for python... no
configure: error: Cannot find python in your system path
```

I then did `brew install python3`, same error. I presume that python3 is not symlinked as `keytool-cli` expects.

```
> whereis python3
python3: /usr/bin/python3 /opt/homebrew/share/man/man1/python3.1
> python3 --version
Python 3.9.6
> alias python='python3'
>
```

Still no luck `./build.sh` still reports `Cannot find python in your system path`