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+===== Install polymake on Mac OS =====
+The latest release 4.9 should work on all Mac OS versions greater or equal to 11. The installation requires a couple of steps (of which you have maybe done some already for other reasons):
+  * Install the xcode command line tools
+  * install Homebrew
+  * install Perlbrew
+  * install some dependencies using Homebrew
+  * install some dependencies using Perlbrew/cpanm
+  * install a python dependence
+  * download and install polymake
+For all steps you need an open Terminal. You can find the Terminal app in the Subfolder //Utilities// of //Applications//.
+If you don't want to install Homebrew, you can try to install dependencies yourself. Some instructions are [[install:macos:source|here]].
+==== Install the Command Line Tools ====
+In the terminal type
+<code>xcode-select --install</code>
+Either this tells you that your command line tools are installed or opens a small window that asks you whether you want to install them. Confirm. It also offers to install the full XCode IDE. This is **not** necessary and **not** recommended (you then need to install the command line tools on top from within XCode).
+==== Install Homebrew ====
+Installation instructions are [[https://brew.sh/|here]]. In most cases it should be sufficient to copy and execute the first code line on that page into your terminal, that is:
+<code>
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+</code>
+==== Install Perlbrew ====
+Installation instructions are  [[https://perlbrew.pl/|here]]. In most cases it should be sufficient to copy and execute the first code line on that page into your terminal, that is:
+<code>
+\curl -L https://install.perlbrew.pl | bash
+</code>
+We have to add some variables to the shell environment. Recent macs usually use ''zsh'' as their shell. You can check this with
+<code>
+echo $SHELL
+</code>
+If you use ''bash'', you have to
+  * replace ''.zshrc'' with ''.bashrc'' in the terminal commands below
+  * add <code>if [ -f ~/.bashrc ]; then . ~/.bashrc; fi </code> at the end of the file ''$HOME/.bash_profile'' if it is not already present
+Now add some paths to your Terminal config and reload the config. For an Intel Mac type the following lines in the terminal:
+<code>
+echo "export PERL5LIB=$HOME/perl5/lib/perl5:$HOME/perl5${PERL5LIB+:$PERL5LIB}" >> $HOME/.zshrc
+echo "source ~/perl5/perlbrew/etc/bashrc" >> $HOME/.zshrc
+echo 'export ARCHFLAGS="-arch x86_64"' >> $HOME/.zshrc
+source $HOME/.zshrc
+</code>
+and for a Silicon Mac use
+<code>
+echo "export PERL5LIB=$HOME/perl5/lib/perl5:$HOME/perl5${PERL5LIB+:$PERL5LIB}" >> $HOME/.zshrc
+echo "source ~/perl5/perlbrew/etc/bashrc" >> $HOME/.zshrc
+echo 'export ARCHFLAGS="-arch arm64"' >> $HOME/.zshrc
+source $HOME/.zshrc
+</code>
+==== Install dependencies with Homebrew ====
+Run the following lines in your terminal:
+<code>
+brew install gmp
+brew install mpfr
+brew install boost
+brew install readline
+brew install ppl
+brew install flint
+brew install singular
+brew install python3
+brew install ninja
+brew install ccache
+brew install mongo-c-driver
+brew install jupyterlab
+</code>
+==== Install dependencies with Perlbrew ====
+Run the following lines in your terminal:
+<code>
+yes N | perlbrew install-cpanm
+cpanm --local-lib=~/perl5 local::lib && eval $(perl -I ~/perl5/lib/perl5/ -Mlocal::lib)
+cpanm SVG
+cpanm JSON
+cpanm install Net::SSLeay
+cpanm Term::ReadLine::Gnu
+cpanm Term::ReadKey
+cpanm XML::SAX
+</code>
+==== Download polymake ====
+You find the sources [[download:start|here]]. Get the source tarball from the Linux section of that page. Download to //Downloads//.
+In the terminal do
+<code>
+cd Downloads
+tar -xvjf polymake-4.11.tar.bz2
+</code>
+==== Configure and install polymake ====
+=== Compilation ===
+Essentially, polymake is compiled and installed with the following commands. This will put the polymake binary into ''/usr/local''. You may have to use ''sudo'' for installing.
+<code>
+cd ~/Downloads/polymake-4.11
+./configure --without-java
+ninja -C build/Opt -j2 install
+</code>
+However, we recommend to install into a directory in your ''$HOME''-folder. For this, create a folder with
+<code>
+mkdir $HOME/<polymake_install_folder>
+</code>
+where ''<polymake_install_folder>'' is a name of your choice, e.g. ''polymake_bin''. Then compile and install with (replace with the correct folder name!)
+<code>
+cd ~/Downloads/polymake-4.11
+./configure --without-java --prefix=$HOME/<polymake_install_folder>
+ninja -C build/Opt -j2 install
+</code>
+You can then call ''polymake'' with
+<code>
+$HOME/<polymake_install_folder>/bin/polymake
+</code>
+or add ''$HOME/<polymake_install_folder>/bin/'' to your path.
+=== Configuration ===
+If you use ''Safari'' as your default browser, then you need to switch to another one for polymake. Please do
+<code>
+set_custom $Visual::webbrowser=open -a "Firefox"
+</code>
+inside the polymake shell. Replace ''Firefox'' by ''Google Chrome'' if you prefer this browser.