(List
  (FunctionDef die []
    (List
      (Com {[LIT_CHARS echo]} {[DQ [VarSub @]]}
        <
        (DescriptorRedirectNode target={[LIT_CHARS 2]} <REDIR_GREATAND "1>&"> 1),
        >
      )
      (Com {[LIT_CHARS exit]} {[LIT_CHARS 1]})
    )
  )
  (AndOr OP_AND_IF
    (Com {[LIT_CHARS test]} {[LIT_CHARS -d]} {[LIT_CHARS autoconf]})
    (AndOr OP_AND_IF
      (Com {[LIT_CHARS test]} {[LIT_CHARS -f]} {[LIT_CHARS autoconf/configure.ac]})
      (Com {[LIT_CHARS cd]} {[LIT_CHARS autoconf]})
    )
  )
  (AndOr OP_OR_IF
    (Com {[LIT_CHARS test]} {[LIT_CHARS -f]} {[LIT_CHARS configure.ac]})
    (Com {[LIT_CHARS die]} {[DQ [LIT_CHARS "Can't find 'autoconf' dir; please cd into it first"]]})
  )
  (Pipeline
    (Com {[LIT_CHARS autoconf]} {[LIT_CHARS --version]})
    (Com {[LIT_CHARS egrep]} {[SQ <LIT_CHARS "2\\.[56][0-9]">]}
      <
      (FilenameRedirectNode filename={[LIT_CHARS /dev/null]} <REDIR_GREAT ">"> 1),
      >
    )
  )
  (If
    (Com {[LIT_CHARS test]} {[VarSub ?]} {[LIT_CHARS -ne]} {[LIT_CHARS 0]})
    (Com {[LIT_CHARS die]} {[DQ [LIT_CHARS "Your autoconf was not detected as being 2.5x or 2.6x"]]})
  )
  (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('cwd', {[ComSub (Com {[LIT_CHARS pwd]})]})])
  (If
    (Com {[LIT_CHARS test]} {[LIT_CHARS -d]} {[LIT_CHARS ../../../autoconf/m4]})
    (List
      (Com {[LIT_CHARS cd]} {[LIT_CHARS ../../../autoconf/m4]})
      (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_m4', {[ComSub (Com {[LIT_CHARS pwd]})]})])
      (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_src_root', {[LIT_CHARS ../..]})])
      (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_obj_root', {[LIT_CHARS ../..]})])
      (Com {[LIT_CHARS cd]} {[VarSub cwd]})
    )
    (Com {[LIT_CHARS test]} {[LIT_CHARS -d]} {[LIT_CHARS ../../llvm/autoconf/m4]})
    (List
      (Com {[LIT_CHARS cd]} {[LIT_CHARS ../../llvm/autoconf/m4]})
      (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_m4', {[ComSub (Com {[LIT_CHARS pwd]})]})])
      (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_src_root', {[LIT_CHARS ..]})])
      (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_obj_root', {[LIT_CHARS ..]})])
      (Com {[LIT_CHARS cd]} {[VarSub cwd]})
    )
    (ElseTrue)
    (While
      (Com {[LIT_CHARS true]})
      (List
        (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "LLVM source root not found."]]})
        (Com {[LIT_CHARS read]} {[LIT_CHARS -p]} {[DQ [LIT_CHARS "Enter full path to LLVM source:"]]} {[LIT_CHARS REPLY]})
        (If
          (Com {[LIT_CHARS test]} {[LIT_CHARS -d]} {[DQ [VarSub REPLY][LIT_CHARS /autoconf/m4]]})
          (List
            (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_src_root', {[DQ [VarSub REPLY]]})])
            (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_m4', {[DQ [VarSub REPLY][LIT_CHARS /autoconf/m4]]})])
            (Com {[LIT_CHARS read]} {[LIT_CHARS -p]} {[DQ [LIT_CHARS "Enter full path to LLVM objects (empty for same as source):"]]} {[LIT_CHARS REPLY]})
            (If
              (Com {[LIT_CHARS test]} {[LIT_CHARS -d]} {[DQ [VarSub REPLY]]})
              (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_obj_root', {[DQ [VarSub REPLY]]})])
              (ElseTrue)
              (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('llvm_obj_root', {[DQ [VarSub llvm_src_root]]})])
            )
            (Com {[LIT_CHARS break]})
          )
        )
      )
    )
  )
  (Com {[LIT_CHARS cp]} {[LIT_CHARS configure.ac]} {[LIT_CHARS configure.bak]})
  (Com {[LIT_CHARS sed]} {[LIT_CHARS -e]} {[DQ [LIT_CHARS "s#^LLVM_SRC_ROOT=.*#LLVM_SRC_ROOT="][\ LIT_ESCAPED_CHAR "\\\""][VarSub llvm_src_root][\ LIT_ESCAPED_CHAR "\\\""][LIT_CHARS "#"]]} {[LIT_CHARS -e]} {[DQ [LIT_CHARS "s#^LLVM_OBJ_ROOT=.*#LLVM_OBJ_ROOT="][\ LIT_ESCAPED_CHAR "\\\""][VarSub llvm_obj_root][\ LIT_ESCAPED_CHAR "\\\""][LIT_CHARS "#"]]} {[LIT_CHARS configure.bak]}
    <
    (FilenameRedirectNode filename={[LIT_CHARS configure.ac]} <REDIR_GREAT ">"> 1),
    >
  )
  (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "Regenerating aclocal.m4 with aclocal"]]})
  (Com {[LIT_CHARS rm]} {[LIT_CHARS -f]} {[LIT_CHARS aclocal.m4]})
  (AndOr OP_OR_IF
    (Com {[LIT_CHARS aclocal]} {[LIT_CHARS -I]} {[VarSub llvm_m4]} {[LIT_CHARS -I]} {[DQ [VarSub llvm_m4][LIT_CHARS /..]]})
    (Com {[LIT_CHARS die]} {[DQ [LIT_CHARS "aclocal failed"]]})
  )
  (Com {[LIT_CHARS echo]} {[DQ [LIT_CHARS "Regenerating configure with autoconf"]]})
  (AndOr OP_OR_IF
    (Com {[LIT_CHARS autoconf]} {[LIT_CHARS --warnings] [LIT_OTHER "="] [LIT_CHARS all]} {[LIT_CHARS -o]} {[LIT_CHARS ../configure]} {[LIT_CHARS configure.ac]})
    (Com {[LIT_CHARS die]} {[DQ [LIT_CHARS "autoconf failed"]]})
  )
  (Com {[LIT_CHARS cd]} {[LIT_CHARS ..]})
  (Com {[LIT_CHARS exit]} {[LIT_CHARS 0]})
)