diff options
Diffstat (limited to 'INSTALL')
-rw-r--r-- | INSTALL | 28 |
1 files changed, 17 insertions, 11 deletions
@@ -117,19 +117,25 @@ ADDITIONAL DISTRIBUTION FILES * Complex Text Layout support libraries -On GNU and Unix systems, Emacs needs the optional libraries "m17n-db", -"libm17n-flt", "libotf" to correctly display such complex scripts as -Indic and Khmer, and also for scripts that require Arabic shaping -support (Arabic and Farsi). On some systems, particularly GNU/Linux, -these libraries may be already present or available as additional -packages. Note that if there is a separate 'dev' or 'devel' package, -for use at compilation time rather than run time, you will need that -as well as the corresponding run time package; typically the dev -package will contain header files and a library archive. Otherwise, -you can download the libraries from <https://www.nongnu.org/m17n/>. +On GNU and Unix systems, Emacs needs optional libraries to correctly +display such complex scripts as Indic and Khmer, and also for scripts +that require Arabic shaping support (Arabic and Farsi). If the +HarfBuzz library is installed, Emacs will build with it and use it for +this purpose. HarfBuzz is the preferred shaping engine, both on Posix +hosts and on MS-Windows, so we recommend installing it before building +Emacs. The alternative for GNU/Linux and Posix systems is to use the +"m17n-db", "libm17n-flt", and "libotf" libraries. (On some systems, +particularly GNU/Linux, these libraries may be already present or +available as additional packages.) Note that if there is a separate +'dev' or 'devel' package, for use at compilation time rather than run +time, you will need that as well as the corresponding run time +package; typically the dev package will contain header files and a +library archive. On MS-Windows, if HarfBuzz is not available, Emacs +will use the Uniscribe shaping engine that is part of the OS. Note that Emacs cannot support complex scripts on a TTY, unless the -terminal includes such a support. +terminal includes such a support. However, most modern terminal +emulators, such as xterm, do support such scripts. * intlfonts-VERSION.tar.gz |