I am bringing together a build environment on a fresh centos 8 image, and encountered this:
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$ yum install gcc-aarch64-linux-gnu
Last metadata expiration check: 0:27:43 ago on Thu 28 Nov 2019 [...]
No match for argument: gcc-aarch64-linux-gnu
Error: Unable to find a match
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warning: /var/cache/dnf/dl.fedoraproject.org_pub_epel_7_aarch64_-182ea4dc2fbb92d0/packages/cross-binutils-common-2.27-9.el7.1.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID 352c64e5: NOKEY
Public key for cross-binutils-common-2.27-9.el7.1.noarch.rpm is not installed
Public key for cross-gcc-common-4.8.5-16.el7.1.noarch.rpm is not installed
Public key for binutils-aarch64-linux-gnu-2.27-9.el7.1.x86_64.rpm is not installed
Public key for gcc-aarch64-linux-gnu-4.8.5-16.el7.1.x86_64.rpm is not installed
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.
Error: GPG check FAILED
This works:
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yum install --nogpgcheck gcc-aarch64-linux-gnu