master
Restore AIX support.
Use unnamed POSIX semaphores on Cygwin.
Move darwin sysroot determination into separate file
Select CFLAGS_SL at configure time, not in platform-specific Makefiles.
Remove traces of support for Sun Studio compiler
On NetBSD, force dynamic symbol resolution at postmaster start.
Switch the semaphore API on Solaris to unnamed POSIX.
thread-safety: gmtime_r(), localtime_r()