gnatstub etc won’t run in GCC 11.1.0 release

The FSF gcc-11.1.0-x64_64-apple-darwin-bin release contains versions of gnatstub, gnattest, gnatpp and gnatmetric which fail to load:

$ /opt/gcc-11.1.0/bin/gnattest --help dyld: Library not loaded: @rpath/libgnarl-11.dylib  Referenced from: /opt/gcc-11.1.0/bin/gnattest  Reason: image not found Abort trap: 6 

Workround:
export DYLD_FALLBACK_LIBRARY_PATH=/opt/gcc-11.1.0/lib/gcc/x86_64-apple-darwin15/11.1.0/adalib