xschem/README_MacOS.md

# Build instructions for MacOS 'Catalina'
Install the latest XQuartz from XQuartz.org.
Install the latest tcl, tk and cairo from MacPorts. 

## xschem compilation
Let's use a recent xschem repository and install it on ~/xschem-macos  

```
git clone https://github.com/StefanSchippers/xschem.git  
cd xschem  
## set prefix to the base directory where xschem and his support files will be installed
## default if unspecified is /usr/local
./configure --prefix=/Users/$(whoami)/xschem-macos
```

Finally, we compile and install the application.  

```
make
make install
```

The application will be placed in `/Users/$(whoami)/xschem-macos/bin` and can be started with
`./xschem` in that folder.

---

# Build Instructions for MacOS 'Big Sur'
In order to compile xschem properly on MacOS, we always need to reference the X libraries from XQuartz
and change some compilation variables. The following dependencies are required:
- XQuartz: https://www.xquartz.org/releases/XQuartz-2.7.11.html
- Tcl: https://prdownloads.sourceforge.net/tcl/tcl8.6.10-src.tar.gz
- Tk: https://prdownloads.sourceforge.net/tcl/tk8.6.10-src.tar.gz  

The first step is to install XQuartz and then compile Tcl and Tk. Nothing special on compiling these two, but
we need to specify the X libraries from XQuartz when compiling Tk. Let's use the path
/usr/local/opt/tcl-tk as destination folder.
## Tcl compilation
Extract the Tcl sources and then go to the unix folder:

```
cd <extracted-folder>/unix
./configure --prefix=/usr/local/opt/tcl-tk  
make
make install
```

## Tk compilation
Same procedure as Tcl, but we need to specificy the Tcl and X libraries paths. XQuartz is installed on
/opt/X11 , so we do:  

```
cd <extracted-folder>/unix
./configure --prefix=/usr/local/opt/tcl-tk \
--with-tcl=/usr/local/opt/tcl-tk/lib --with-x \
--x-includes=/opt/X11/include --x-libraries=/opt/X11/lib  
make
make install  
```

## xschem compilation
Besides referencing the X libraries, we need to also point to the Tcl/Tk installation path. Let's use a recent
xschem repository and install it on ~/xschem-macos (adapt this to your username):  

```
git clone https://github.com/StefanSchippers/xschem.git  
cd xschem  
## set prefix to the base directory where xschem and his support files will be installed
## default if unspecified is /usr/local
./configure --prefix=/Users/$(whoami)/xschem-macos
```

Before building the application, we need to adjust `Makefile.conf` because the current configure
script doesn't support custom flags. So we need to replace the CFLAGS and LDFLAGS variables in that file
as below:  

```
CFLAGS=-I/opt/X11/include -I/opt/X11/include/cairo \
-I/usr/local/opt/tcl-tk/include -O2
LDFLAGS=-L/opt/X11/lib -L/usr/local/opt/tcl-tk/lib -lm -lcairo \
-lX11 -lXrender -lxcb -lxcb-render -lX11-xcb -lXpm -ltcl8.6 -ltk8.6
```

Finally, we compile and install the application.  

```
make
make install
```

The application will be placed in `/Users/$(whoami)/xschem-macos/bin` and can be started with
`./xschem` in that folder.