Download the master.zip from https://github.com/facebook/hhvm (careful, it's like 30MB).
unzip it. observe lots of really weird output flying by. stop extraction and look closer: ~/hhvm-master/hphp/third_party/ti> ls -l total 8 lrwxr-xr-x 1 tedu tedu 633 Jan 8 11:26 CMakeLists.txt@ -> set(CXX_SOURCES)?auto_sources(files "*.cpp" "RECURSE" "${CMAKE_CURRENT_SOURCE_DIR}")?list(APPEND CXX_SOURCES ${files})??find_package(Boost 1.48.0 COMPONENTS thread system REQUIRED)?include_directories(${Boost_INCLUDE_DIRS})? link_directories(${Boost_LIBRARY_DIRS})??include_directories ("${HPHP_HOME}/hphp/third_party")?add_library(hphp_proxygen STATIC ${CXX_SOURCES})??add_dependencies(hphp_proxygen hphp_thrift)?target_link_libraries(hphp_proxygen hphp_thrift ? ${Boost_LIBRARIES}? ${LIBGLOG_LIBRARY}? ${LIBPTHREAD_LIBRARIES})?? I didn't even know zip files supported symlinks, apparently they do. But why is it creating symlinks to the file contents? Is the zip file broken (github to blame) or is unzip broken? I don't know enough to peer into the file. Apologies for being only tangentially openbsd related.