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BSD sed doesnt grok '-r' and it's used all over the place in crosstool-ng.
The (FreeBSD) sed option for extended regular expressions is -E, but a quick hack alternative would be to just do "alias sed gsed" in the beginning of the script. :)
What would be desired would be either some environment vars or some configure time detection that does the right thing or a flag called 'use BSD names for gnu utils'
SED="gsed" AWK="gawk"
and replacing direct invocations of sed, awk, e.g. with ${SED}, ${AWK}, and so on.
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