As discussed in ${URL} the current license description for libgcrypt is incomplete due to helper tools included being GPLv3. Expected to be changed as seen in thread, but if not it we will have to update our license to match.
*** Bug 911969 has been marked as a duplicate of this bug. ***
As per https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=blob;f=LICENSES;h=c2fea82dc58c77805b5bf0e61de901114cf2a810;hb=f019c98fd418596074ffd2cc755be6c483aac932 there are more licenses involved than just LGPL-2.1 and at least one of them has also an option to use GPL-x or later (without specifying which version of the GPL). I cannot find any reference to the MIT license.