Errors in hotspot build?
make VM_SUBDIR=debug EXPORT_SUBDIR=/debug generic_export
make: Entering directory `/cygdrive/c/Prg/jdk1.6.0-b92-src/hotspot/make'
make: *** No rule to make target `C:\Prg\jdk1.6.0-private/export-windows-i586
/debug/include/jvmti.h', needed by `generic_export'. Stop.
make: Leaving directory `/cygdrive/c/Prg/jdk1.6.0-b92-src/hotspot/make'
make: *** [export_debug] Error 2
Looks like either a generated header file isn't being built, or else isn't present, in the b92 build. (This is from a "make all_debug"; can post "make sanity" results if requested, but didn't want to pollute the post if it wasn't relevant.)