# Using the power of Ruby

task :default => [:main]

def ext(fn, newext)

fn.sub(/\.[^.]+$/, newext)

end

SRCFILES = Dir OBJFILES = SRCFILES.collect { |fn| ext(fn,“.o”) }

OBJFILES.each do |objfile|

srcfile = ext(objfile, ".c")
file objfile => [srcfile] do |t|
  sh "gcc #{srcfile} -c -o #{t.name}"
end

end

file “main” => OBJFILES do |t|

sh "gcc -o #{t.name} main.o a.o b.o"

end

task :clean do

rm_f FileList['*.o']
Dir['*~'].each { |fn| rm_f fn }

end

task :clobber => [:clean] do

rm_f "main"

end

task :run => [“main”] do

sh "./main"

end