task :default => [:main]

file “a.o” => [“a.c”] do |t|

src = t.name.sub(/\.o$/, '.c')
sh "gcc #{src} -c -o #{t.name}"

end

file “b.o” => [“b.c”] do |t|

src = t.name.sub(/\.o$/, '.c')
sh "gcc #{src} -c -o #{t.name}"

end

file “main.o” => [“main.c”] do |t|

src = t.name.sub(/\.o$/, '.c')
sh "gcc #{src} -c -o #{t.name}"

end

OBJFILES = [“a.o”, “b.o”, “main.o”] task :obj => OBJFILES

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