10.15 (Catalina) and Xcode11 upgrade information

Fink 0.45.0 and up support the upcoming macOS 10.15 (Catalina) release, 
but there are some important things to note:

* Apple locked down the / (root) directory where Fink normally installs 
(in /sw by default), so existing Fink installs may become read-only upon 
updating to 10.15.
* Xcode11 introduces some known breakages (with no known fixes at this 
time) to important packages like gcc, so not everything will build yet.

Once macOS 10.15 is officially released, we suggest waiting to upgrade 
until we know how the system will treat existing installs and we can 
determine the best upgrade path.

For anyone installing Fink for the first time (on 10.15beta or an 
earlier macOS version), we now recommend using /opt/sw as the install 
location, since that's known to work. The next Fink release after macOS 
10.15 is out will use /opt/sw as the default install location.

Xcode11 is known to currently break building the gccX and several other 
important packages. If possible (especially 10.14 users), hold off on 
upgrading to Xcode11 unless you need something specific from it. If you 
do upgrade to Xcode11, make sure that the Command Line Tools are also 
upgraded to version 11 for your macOS release.

Hanspeter


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