pentium-builder 0.21+nmu2ubuntu1 (amd64 binary) in ubuntu mantic

 Replaces gcc, cc, and g++ with scripts that build pentium optimized code.
 (Other processors can be optimized for as well.)
 .
 By default, after installing this package, the compilers will behave
 normally. However, if the environment variable DEBIAN_BUILDARCH=pentium
 is set, they will enter pentium optimized compile mode.