Missing build instructions for MacOS running MacPorts in README.md

[pilonsi]

The README.md file is missing instructions for building on a MacPorts MacOS system. These would be:

To fetch required dependencies:

$ sudo port install python311 gmake gawk gsed gmp mpfr libmpc isl zlib expat texinfo flock
$ sudo ln -s /opt/local/bin/gmake /opt/local/libexec/gnubin/gnumake

Before running ./configure:

$ export PATH=/opt/local/libexec/gnubin:$PATH 
$ export CPPFLAGS=-I/opt/local/include 
$ export LDFLAGS=-L/opt/local/lib

I have added gmake to the install list because when building the Linux toolchaing glibc complains that the system make is too old:

$ make linux
[...]
configure: error:                                                                                                                                                                 
*** These critical programs are missing or too old: make                 
*** Check the INSTALL file for required versions.
make: *** [stamps/build-glibc-linux-headers] Error 1
[...]

$ cat glibc/INSTALL | grep make
[...]
   * GNU 'make' 4.0 or newer
[...]

$ make --version
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i386-apple-darwin11.3.0

Maybe this issue also happens when building from Homebrew but I cannot test it.

I have tested these building both the Newlib and Linux toolchains on a MacOS 12.6.8 host.

I have added these changes to the README.md file here. If it looks OK I can submit a PR.

[cmuellner]

Sorry for not responding earlier. Please go ahead and file a PR to adjust the MacOS build instructions as needed.