libnss3-dev - 2:3.61-1+deb11u4 main

This is a set of libraries designed to support cross-platform development
of security-enabled client and server applications. It can support SSLv2
and v4, TLS, PKCS #5, #7, #11, #12, S/MIME, X.509 v3 certificates and
other security standards.
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Install this package if you wish to develop your own programs using the
Network Security Service Libraries.