When installing the Azure Sphere SDK for Linux (21.1.1.10482) on Debian 4.19.146-1 x86_64 the installation script does not proceed with the install because it claims to require the libgcc-s1 package.
I was unable to find any package named libgcc-s1 in Debian's package listing.
As a workaround I deleted the line in the installation script that referenced libgcc-s1.
When the libgcc-s1 dependency is removed the script runs and successfully installs the SDK.