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This issue happened when `libc.so` and `libm.so` path were not found and `ldd ruby` command also failed to print the shared dependencies in `test/fiddle/helper.rb`. See https://travis-ci.org/ruby/ruby/jobs/611483288#L3018 /home/travis/build/ruby/ruby/build/.ext/common/fiddle/import.rb:299:in `import_function': cannot find the function: strcpy() (Fiddle::DLError) * Set libc6:armhf as a installing dependency explicitly. * Remove arm32 from allow_failures.