/usr/lib/llvm-3.4/build/autoconf/ is in llvm-3.4-dev 1:3.4-1ubuntu3~precise2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/llvm-3.4/build/autoconf/AutoRegen.sh
/usr/lib/llvm-3.4/build/autoconf/ExportMap.map
/usr/lib/llvm-3.4/build/autoconf/README.TXT
/usr/lib/llvm-3.4/build/autoconf/config.guess
/usr/lib/llvm-3.4/build/autoconf/config.sub
/usr/lib/llvm-3.4/build/autoconf/configure.ac
/usr/lib/llvm-3.4/build/autoconf/depcomp
/usr/lib/llvm-3.4/build/autoconf/install-sh
/usr/lib/llvm-3.4/build/autoconf/ltmain.sh
/usr/lib/llvm-3.4/build/autoconf/m4/
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/usr/lib/llvm-3.4/build/autoconf/m4/c_printf_a.m4
/usr/lib/llvm-3.4/build/autoconf/m4/check_gnu_make.m4
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/usr/lib/llvm-3.4/build/autoconf/m4/find_std_program.m4
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/usr/lib/llvm-3.4/build/autoconf/m4/func_isnan.m4
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/usr/lib/llvm-3.4/build/autoconf/m4/linux_mixed_64_32.m4
/usr/lib/llvm-3.4/build/autoconf/m4/ltdl.m4
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/usr/lib/llvm-3.4/build/autoconf/mkinstalldirs