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< import os.path
---
> import os.path, sys
137c137,138
< isa_desc_builder = Builder(action='python2.4 $SOURCES $TARGET.dir $CPU_MODELS',
---
> python = sys.executable # use same Python binary used to run scons
> isa_desc_builder = Builder(action=python + ' $SOURCES $TARGET.dir $CPU_MODELS',