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365805327c
If $CC has --sysroot=/, it is a valid configuration however libtool will then set lt_sysroot to "/". This means references like $lt_sysroot$libdir become //usr/lib instead of the more normally expected /usr/lib. This may or may not break something but certainly is confusing to the user and gives confusing output. Making "/" simply unset lt_sysroot is much cleaner. Whilst here, trim any trailing '/' from sysroot paths to drop the duplication and result in cleaner/consistent output. * m4/libtool.m4: Cleanup sysroot trailing '/' handling.