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Added installation instructions for MacOS (Big Sur). 

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new file:   INSTALL_MacOS.md
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Harald Pretl 2021-10-02 11:29:43 +02:00
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# In order to install magic on MacOS (Big Sur) follow these steps:
## Build Tcl for X11
We are following the instructions from xschem (https://github.com/StefanSchippers/xschem/blob/master/README_MacOS.md).
* Download Tcl from https://prdownloads.sourceforge.net/tcl/tcl8.6.10-src.tar.gz
We are using not `opt` but `opt2` so that this Tcl does not interfere with `tcl-tk` from HomeBrew.
```
./configure --prefix=/usr/local/opt2/tcl-tk
make
make install
```
## Build Tk for X11
* Download Tk from https://prdownloads.sourceforge.net/tcl/tk8.6.10-src.tar.gz
```
./configure --prefix=/usr/local/opt2/tcl-tk \
--with-tcl=/usr/local/opt2/tcl-tk/lib --with-x \
--x-includes=/opt/X11/include --x-libraries=/opt/X11/lib
make
make install
```
## Build magic
We need to provide this `tcl-tk` and suppress compilation errors.
```
./configure --with-tcl=/usr/local/opt2/tcl-tk/lib \
--with-tk=/usr/local/opt2/tcl-tk/lib \
--x-includes=/opt/X11/include \
--x-libraries=/opt/X11/lib \
CFLAGS=-Wno-error=implicit-function-declaration
make
make install
```