Extract upstream libarchive using the following shell code.

url=https://libarchive.googlecode.com/svn/release/3.0
v=3.0.2
r=4051
paths="
  CMakeLists.txt
  COPYING
  CTestConfig.cmake
  build/cmake
  build/pkgconfig
  build/utils
  build/version
  libarchive/*.*
"
date=$(svn log -q -c$r $url |
       sed -n "/^r/ {s/[^|]*|[^|]*|//;p;}")
svn export -r$r $url libarchive-$v-r$r &&
mkdir libarchive-$v-r$r-reduced &&
(cd libarchive-$v-r$r && tar c $paths) |
(cd libarchive-$v-r$r-reduced && tar x)
echo "r$r date: $date"