Converting blast+ output to gff (with gaps)

I assume this has already been done many times, but I can't seem to find it on bioperl.org or via google.

I'm looking for a script that will take one of the blast+ outformats that includes the positions of gaps and
mismatches, and create gff with appropriate subfeatures.  

Thanks,

Jim
=====================================
Jim Hu
Professor
Dept. of Biochemistry and Biophysics
2128 TAMU
Texas A&M Univ.
College Station, TX 77843-2128
979-862-4054