D.3.27 Modifications de la version 3.21.9

• Added --enable-unix-socket=pathname option to configure.
• Fixed a couple of portability problems with include files.
• Fixed bug in range calculation that could return empty set when searching on multiple key with only one entry (very rare).
• Most things ported to FSU Pthreads, which should allow MySQL to run on SCO. 4.11.12 SCO.