Found the following significant warnings:
  libgit2/src/streams/stransport.c:63:8: warning: 'SSLHandshake' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:69:13: warning: 'SSLCopyPeerTrust' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:75:13: warning: 'SecTrustEvaluate' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:107:13: warning: 'SSLCopyPeerTrust' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:167:13: warning: 'SSLWrite' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:214:13: warning: 'SSLRead' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:225:8: warning: 'SSLClose' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:262:12: warning: 'SSLCreateContext' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:262:35: warning: 'kSSLClientSide' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:262:51: warning: 'kSSLStreamType' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:269:13: warning: 'SSLSetIOFuncs' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:270:13: warning: 'SSLSetConnection' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:271:13: warning: 'SSLSetSessionOption' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:271:42: warning: 'kSSLSessionOptionBreakOnServerAuth' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:272:13: warning: 'SSLSetProtocolVersionMin' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:272:47: warning: 'kTLSProtocol1' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:273:13: warning: 'SSLSetProtocolVersionMax' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:273:47: warning: 'kTLSProtocol12' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
  libgit2/src/streams/stransport.c:274:13: warning: 'SSLSetPeerDomainName' is deprecated: first deprecated in macOS 10.15 - No longer supported. Use Network.framework. [-Wdeprecated-declarations]
See ‘/Volumes/Builds/packages/big-sur-arm64/results/4.1/git2r.Rcheck/00install.out’ for details.