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After a recent update to my Cygwin installation, suddenly
configure-generated libtool scripts give me this error when compiling
and linking C++ code:
libtool: ignoring unknown tag CXX
And even worse, it tries to use gcc to link, which of course fails
because of undefined symbols provided by libstdc++.
Using the /usr/bin/libtool instead works, so this would seem to be
caused during the generation of the package libtool.
So I guessed that the sed update was the problem, and I was right.
Downgrading sed to 4.1.4-1 makes everything work again.
I'm attaching my cygcheck output (before I downgraded sed).