Binary package “lib64stdc++-9-dev-i386-cross” in ubuntu focal

GNU Standard C++ Library v3 (development files) (i386)

 This package contains the headers and static library files necessary for
 building C++ programs which use libstdc++.
 libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which
 was included up to g++-2.95. The first version of libstdc++-v3 appeared
 in g++-3.0.
 This package contains files for i386 architecture, for use in cross-compile

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