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Some packages (eg mesa) will invoke a tool with --version and do string matches on the output (i.e. mesa does $LEX --version |grep "^flex "). This doesn't work with the combination of wrapper scripts and binaries that use $0 as they output "flex.real". Luckily bash's exec lets you set $0. As we want to use this we can't use env, but using export appears to work just as well. (From OE-Core rev: e8d2a2a3646f964ec61ece62e14788cd7184dd01) Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>