## Changes Introduced in V9.2.8

The following describes the most significant changes which occurred in the AST library between versions V9.2.7 and V9.2.8:

1. The Fortran interface has been changed to fix a bug caused by a change in the way that gfortran passes character arguments. As of gfortran V8 the length of each character argument passed to a subroutine is stored in a size_t value rather than an int value. AST now tests the version of gfortran at configure-time, and uses int or size_t within the Fortran API as appropriate. Prior to this change int was always used, which could cause undefined behaviour and segmentation faults when calling AST routines under gfortran v8 and later.

2. A bug has been fixed in astRebinSeq that could cause NaN values to appear in the output array in cases where the overlap between two input arrays is very small. The fix corrects the way in which the mean weight per input pixel is calculated. It may cause some general minor changes to the decision about which output pixels pass the “wlim” criterion.