Since we havn't had a release for absolutely ages:

ORBit2-2.12.3

* bug fixes
+ reduce stack size for I/O thread (Mark)
+ work with pkg-config >= 0.16 (James H)
+ check for netdb.h (Sandie Vanderme)
+ release lock in ORB destroy (Aivars Kalvans)
+ error condition fix in demarshaling (Michael)
+ check for sys/sockio.h (James Andrewartha)
+ AC_PREREQ bump (Gustavo Gama)
+ add threading libs to name service (Diego Petteno)