* Bugfix in copy constructor for C++ and Python interfaces.
+* Bugfix in return value for setting min/max objective.
+
+* Handle negative rescalings in COBYLA and BOBYQA.
+
+* Plugin installation honors the configure --prefix, if any
+ (thanks to xantares@github).
+
+* Various compilation fixes for compatibility with recent software.
+
NLopt 2.3.1 (16 September 2012)
* Bug fix: COBLYA should return ROUNDOFF_LIMITED rather than XTOL_REACHED