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Because some countries have legal restrictions on encryption software, gpg is not provided by TeX Live. Tlmgr will operate without security enhancements if gpg is absent.
Most Macintosh users don't directly access tlmgr, but instead use it indirectly through TeX Live Utility, which is installed in /Applications/TeX. TeX Live Utility has been upgraded to support the new tlmgr. When it first runs after TeX Live 2016 is installed, it displays a dialog titled ``Enable security validation of packages.". If the user clicks "Enable," gpg is downloaded from a third party site and installed inside TeX Live.
MacTeX-2016 still supports Leopard on both PowerPC and Intel machines. This support is becoming more and more difficult to provide. Because Leopard has an old version of perl, the enhanced tlmgr did not run on it until the author, Norbert Preining, added code to work around these perl problems at the very end of TeX Live 2016 development.
Moreover, recent copies of TeX Live Utility do not run on Leopard, so MacTeX installs a very old version of that program. Source code for that version is no longer available, so TeX Live Utility on Leopard cannot be changed. Since TeX Live Utility calls tlmgr to provide actual updates, the changes in tlmgr affect its performance.
TeX Live Utility can install two types of updates to TeX Live: critical updates and regular updates. The program still works in TeX Live 2016 for regular updates. But for critical updates, it appears to work and then reports an error at the last moment. This error does no harm to the system, but users must then install the critical update from the command line. Open Terminal in /Applications/Utilities and type the command
Unfortunately, this Preference Pane was a plugin for System Preferences, and if Apple changed System Preferences, then the Preference Pane needed to be recoded. Apple often made changes. Originally the Pane required PPC code. After the Intel transition, it required both PPC and Intel code bundled in a universal binary. When 64 bit Macintoshes were introduced, the Pane required 64 bit code using garbage collection. Then garbage collection proved too slow for the iPhone, so Apple invented a new memory management technique called Automatic Reference Counting, and they required that the 64 bit code use Automatic Reference Counting rather than garbage collection. Indeed, garbage collection is now deprecated on the Mac.
Handling these various versions became a nightmare. MacTex had to have copies of all the forms of the Preference Pane, and select the appropriate copy for the user's particular operating system. But if the user later updated to a new system, the Preference Pane could stop working.
In MacTeX 2016, the functionality of the Preference Pane has been moved to TeX Live Utility and the Preference Pane is no longer provided. To see a list of TeX distributions on your machine, run TeX Live Utility and select the item "Reconfigure Distributions..." from the Configure menu. A list of distributions will appear. Select the distribution you want to activate.
MacTeX does not remove old Preferencee Panes. The Pref Pane and TeX Live Utility do the same thing to switch between distributions, so if your Pane still works, you can continue to use it. To remove the pane, go to /Library/PreferencePanes and move TeXDistPrefPane.prefPane to the trash.
Many users know that /Library/TeX/texbin is a symbolic link to the binaries of the active distribution, replacing /usr/texbin in older systems. However, this link is NOT changed by either the Pref Pane or TeX Live Utility when switching distributions. Avoid the temptation to switch without help!
Users on all systems can switch distributions using Terminal. Type
If you have an active Leopard system and want to urge continuation of support, please write one of
Both MacTeX and BasicTeX install ``TeX Distribution Data Structures'' in /Library/TeX/Distributions containing links to various parts of the distribution. This data is used by TeX Live Utility, by Ghostscript, and by others. Data structures from other distributions remain untouched. Our philosophy is that each distribution should control its own data.
Ghostscript-9.19, released just before work began on MacTeX-2016, was extensively customized to support typesetting in the Far East. We were initially contacted by Munehiro Yamamoto about revisions for Japan. Then work was done by Kuroki Yusuke, Bruno Voisin, and Norbert Preining to perfect the configuration.
Ghostscript installs resources in /usr/local/share/ghostscript/9.18/Resource. By adding material to this location, Ghostscript can be enhanced without recompiling. Ghostscript comes with the "base 35" fonts required for Postscript, and this is enough for standard TeX applications like converting postscript files to pdf files, or converting eps illustrations to png illustrations. But sometimes, Ghostscript requires access to additional fonts. Two years ago, Bruno Voisin extended our Ghostscript package to give it access to many pfb font files in TeX Live.
In China, Japan, and Korea, more much extensive knowledge of CJK fonts is often required, depending on the typesetting engine used. Yusuke, Voisin, and Preining provide this knowledge for Japanese. Preliminary work has also been done for Chinese and Korean. In addition, Preining wrote a script which can search a user's machine for other fonts and add appropriate configuration files to Ghostscript. All of this is described in more detail in a document MacTeX installs in /Applications/TeX, and in a READ ME file for users in Japan by Yusuke Terada, also installed in /Applications/TeX.
MacTeX installs a completely unmodified copy of the full TeX Live 2016 distribution. This is exactly the same distribution that runs on OS X, Windows, GNU/Linux, various BSD Unix systems, and other systems.
MacTeX-2016 contains two binary directories. The first, universal-darwin, contains 32 bit binaries for Intel and PowerPC; these run on Macs which have OS X 10.5 or later. The second, x86_64-darwin, contains 64 bit Intel binaries compiled on Snow Leopard; these programs run on Intel machines which are 64 bit capable and are running Snow Leopard or higher.
For new features in TeX Live 2016, see The TeX Live Guide for TeX Live 2016.
Other changes in LuaTeX break support for dfonts on the Macintosh when using this program.
Users extensively using LuaTeX should join appropriate mailing lists about the program, visit LuaTeX blogs, etc.
We'd like to call attention to three changes in TeX Live 2010 which remain important today: