/usr/include/php5/main/ is in php5-dev 5.3.10-1ubuntu3.26.
This file is owned by root:root, with mode 0o755.
..
/usr/include/php5/main/SAPI.h
/usr/include/php5/main/build-defs.h
/usr/include/php5/main/fopen_wrappers.h
/usr/include/php5/main/logos.h
/usr/include/php5/main/php.h
/usr/include/php5/main/php3_compat.h
/usr/include/php5/main/php_compat.h
/usr/include/php5/main/php_config.h
/usr/include/php5/main/php_content_types.h
/usr/include/php5/main/php_getopt.h
/usr/include/php5/main/php_globals.h
/usr/include/php5/main/php_ini.h
/usr/include/php5/main/php_logos.h
/usr/include/php5/main/php_main.h
/usr/include/php5/main/php_memory_streams.h
/usr/include/php5/main/php_network.h
/usr/include/php5/main/php_open_temporary_file.h
/usr/include/php5/main/php_output.h
/usr/include/php5/main/php_reentrancy.h
/usr/include/php5/main/php_scandir.h
/usr/include/php5/main/php_streams.h
/usr/include/php5/main/php_syslog.h
/usr/include/php5/main/php_ticks.h
/usr/include/php5/main/php_variables.h
/usr/include/php5/main/php_version.h
/usr/include/php5/main/rfc1867.h
/usr/include/php5/main/safe_mode.h
/usr/include/php5/main/snprintf.h
/usr/include/php5/main/spprintf.h
/usr/include/php5/main/streams/
/usr/include/php5/main/streams/php_stream_context.h
/usr/include/php5/main/streams/php_stream_filter_api.h
/usr/include/php5/main/streams/php_stream_glob_wrapper.h
/usr/include/php5/main/streams/php_stream_mmap.h
/usr/include/php5/main/streams/php_stream_plain_wrapper.h
/usr/include/php5/main/streams/php_stream_transport.h
/usr/include/php5/main/streams/php_stream_userspace.h
/usr/include/php5/main/streams/php_streams_int.h
/usr/include/php5/main/suhosin_globals.h
/usr/include/php5/main/suhosin_logo.h
/usr/include/php5/main/suhosin_patch.h
/usr/include/php5/main/win32_internal_function_disabled.h