• Unbreak the build on Tier-2 systems (PowerPC and SPARC)
• Define LICENSE and move PROJECTHOST where it logically belongs
• Propagate available SIMD support down to the compiler (x86 only)
• Do not enforce -O3; update/improve `x-generate-plist' target
• Provide a better port description text while I am here

Tested on: local Mac mini G4 (powerpc), flame (sparc64)