old_contents: import sys
  
  from yaku.scheduler \
      import \
          run_tasks
  from yaku.context \
      import \
          get_bld, get_cfg
  
  from yaku.conftests.fconftests \
      import \
          check_fcompiler, check_fortran_verbose_flag, \
          check_fortran_runtime_flags, check_fortran_dummy_main, \
          check_fortran_mangling
  
  def configure(ctx):
      ctx.use_tools(["ctasks", "cxxtasks"])
      ctx.load_tool("fortran")
      ctx.builders["fortran"].configure(candidates=["ifort"])
  
      check_fcompiler(ctx)
      check_fortran_verbose_flag(ctx)
      check_fortran_runtime_flags(ctx)
      check_fortran_dummy_main(ctx)
      check_fortran_mangling(ctx)
  
  def build(ctx):
      builder = ctx.builders["fortran"]
      builder.program("fbar", ["src/bar.f"])
  
      builder = ctx.builders["ctasks"]
      builder.program("cbar", ["src/bar.c"])
  
      builder = ctx.builders["cxxtasks"]
      builder.program("cxxbar", ["src/bar.cxx"])
  
  if __name__ == "__main__":
      ctx = get_cfg()
      configure(ctx)
      ctx.store()
  
      ctx = get_bld()
      build(ctx)
      run_tasks(ctx)
      ctx.store()
  
new_contents: import sys
  
  from yaku.scheduler \
      import \
          run_tasks
  from yaku.context \
      import \
          get_bld, get_cfg
  
  from yaku.conftests.fconftests \
      import \
          check_fcompiler, check_fortran_verbose_flag, \
          check_fortran_runtime_flags, check_fortran_dummy_main, \
          check_fortran_mangling
  
  def configure(ctx):
      ctx.use_tools(["ctasks", "cxxtasks"])
      ctx.load_tool("fortran")
      ctx.builders["fortran"].configure(candidates=["gfortran"])
  
      check_fcompiler(ctx)
      check_fortran_verbose_flag(ctx)
      check_fortran_runtime_flags(ctx)
      check_fortran_dummy_main(ctx)
      check_fortran_mangling(ctx)
  
  def build(ctx):
      builder = ctx.builders["fortran"]
      builder.program("fbar", ["src/bar.f"])
  
      builder = ctx.builders["ctasks"]
      builder.program("cbar", ["src/bar.c"])
  
      builder = ctx.builders["cxxtasks"]
      builder.program("cxxbar", ["src/bar.cxx"])
  
  if __name__ == "__main__":
      ctx = get_cfg()
      configure(ctx)
      ctx.store()
  
      ctx = get_bld()
      build(ctx)
      run_tasks(ctx)
      ctx.store()
  
subject: use gfortran in fortran example.