我跟随tutorial在我的mac OSX Yosemite 10.10.1，Xcode版本6.3上的rails上安装ruby。
每一件事情都是正确的，直到$ ruby -v它在终端ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14]上提供以下输出，这意味着完全安装了ruby。
我安装了红宝石。并安装了Homebrew。但是当我在我的终端中放置$ brew doctor命令以检查Homebrew是否正常工作时，它会显示警告列表。
Last login: Sat Apr 11 17:57:42 on ttys000
MacBook-Air:~ ankushkushwaha$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!
Warning: Some directories in /usr/local/share/locale aren't writable.
This can happen if you "sudo make install" software that isn't managed
by Homebrew. If a brew tries to add locale information to one of these
directories, then the install will fail during the link step.
You should probably `chown` them:
/usr/local/share/locale/be
/usr/local/share/locale/be/LC_MESSAGES
/usr/local/share/locale/ca
/usr/local/share/locale/ca/LC_MESSAGES
/usr/local/share/locale/da
/usr/local/share/locale/da/LC_MESSAGES
/usr/local/share/locale/de
/usr/local/share/locale/de/LC_MESSAGES
/usr/local/share/locale/el
/usr/local/share/locale/el/LC_MESSAGES
/usr/local/share/locale/es
/usr/local/share/locale/es/LC_MESSAGES
/usr/local/share/locale/fi
/usr/local/share/locale/fi/LC_MESSAGES
/usr/local/share/locale/fr
/usr/local/share/locale/fr/LC_MESSAGES
/usr/local/share/locale/id
/usr/local/share/locale/id/LC_MESSAGES
/usr/local/share/locale/ja
/usr/local/share/locale/ja/LC_MESSAGES
/usr/local/share/locale/nl
/usr/local/share/locale/nl/LC_MESSAGES
/usr/local/share/locale/ru
/usr/local/share/locale/ru/LC_MESSAGES
/usr/local/share/locale/sr
/usr/local/share/locale/sr/LC_MESSAGES
/usr/local/share/locale/sv
/usr/local/share/locale/sv/LC_MESSAGES
/usr/local/share/locale/tr
/usr/local/share/locale/tr/LC_MESSAGES
/usr/local/share/locale/uk
/usr/local/share/locale/uk/LC_MESSAGES
/usr/local/share/locale/vi
/usr/local/share/locale/vi/LC_MESSAGES
/usr/local/share/locale/zh_CN
/usr/local/share/locale/zh_CN/LC_MESSAGES
/usr/local/share/locale/zh_TW
/usr/local/share/locale/zh_TW/LC_MESSAGES
Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected dylibs:
/usr/local/lib/libgcc_ext.10.4.dylib
/usr/local/lib/libgcc_ext.10.5.dylib
/usr/local/lib/libgcc_s.1.dylib
/usr/local/lib/libgfortran.3.dylib
/usr/local/lib/libgomp.1.dylib
/usr/local/lib/libquadmath.0.dylib
/usr/local/lib/libssp.0.dylib
/usr/local/lib/libstdc++.6.dylib
Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected header files:
/usr/local/include/c++/4.6.0/backward/auto_ptr.h
/usr/local/include/c++/4.6.0/backward/backward_warning.h
/usr/local/include/c++/4.6.0/backward/binders.h
/usr/local/include/c++/4.6.0/backward/hash_fun.h
/usr/local/include/c++/4.6.0/backward/hashtable.h
/usr/local/include/c++/4.6.0/bits/algorithmfwd.h
/usr/local/include/c++/4.6.0/bits/allocator.h
/usr/local/include/c++/4.6.0/bits/atomic_0.h
/usr/local/include/c++/4.6.0/bits/atomic_2.h
/usr/local/include/c++/4.6.0/bits/atomic_base.h
/usr/local/include/c++/4.6.0/bits/basic_ios.h
/usr/local/include/c++/4.6.0/bits/basic_string.h
/usr/local/include/c++/4.6.0/bits/boost_concept_check.h
/usr/local/include/c++/4.6.0/bits/c++0x_warning.h
/usr/local/include/c++/4.6.0/bits/char_traits.h
/usr/local/include/c++/4.6.0/bits/codecvt.h
/usr/local/include/c++/4.6.0/bits/concept_check.h
/usr/local/include/c++/4.6.0/bits/cpp_type_traits.h
/usr/local/include/c++/4.6.0/bits/cxxabi_forced.h
/usr/local/include/c++/4.6.0/bits/exception_defines.h
/usr/local/include/c++/4.6.0/bits/exception_ptr.h
/usr/local/include/c++/4.6.0/bits/forward_list.h
/usr/local/include/c++/4.6.0/bits/functexcept.h
/usr/local/include/c++/4.6.0/bits/functional_hash.h
/usr/local/include/c++/4.6.0/bits/gslice.h
/usr/local/include/c++/4.6.0/bits/gslice_array.h
/usr/local/include/c++/4.6.0/bits/hash_bytes.h
/usr/local/include/c++/4.6.0/bits/hashtable.h
/usr/local/include/c++/4.6.0/bits/hashtable_policy.h
/usr/local/include/c++/4.6.0/bits/indirect_array.h
/usr/local/include/c++/4.6.0/bits/ios_base.h
/usr/local/include/c++/4.6.0/bits/locale_classes.h
/usr/local/include/c++/4.6.0/bits/locale_facets.h
/usr/local/include/c++/4.6.0/bits/locale_facets_nonio.h
/usr/local/include/c++/4.6.0/bits/localefwd.h
/usr/local/include/c++/4.6.0/bits/mask_array.h
/usr/local/include/c++/4.6.0/bits/move.h
/usr/local/include/c++/4.6.0/bits/nested_exception.h
/usr/local/include/c++/4.6.0/bits/ostream_insert.h
/usr/local/include/c++/4.6.0/bits/postypes.h
/usr/local/include/c++/4.6.0/bits/random.h
/usr/local/include/c++/4.6.0/bits/range_access.h
/usr/local/include/c++/4.6.0/bits/regex.h
/usr/local/include/c++/4.6.0/bits/regex_compiler.h
/usr/local/include/c++/4.6.0/bits/regex_constants.h
/usr/local/include/c++/4.6.0/bits/regex_cursor.h
/usr/local/include/c++/4.6.0/bits/regex_error.h
/usr/local/include/c++/4.6.0/bits/regex_grep_matcher.h
/usr/local/include/c++/4.6.0/bits/regex_nfa.h
/usr/local/include/c++/4.6.0/bits/shared_ptr.h
/usr/local/include/c++/4.6.0/bits/shared_ptr_base.h
/usr/local/include/c++/4.6.0/bits/slice_array.h
/usr/local/include/c++/4.6.0/bits/stl_algo.h
/usr/local/include/c++/4.6.0/bits/stl_algobase.h
/usr/local/include/c++/4.6.0/bits/stl_bvector.h
/usr/local/include/c++/4.6.0/bits/stl_construct.h
/usr/local/include/c++/4.6.0/bits/stl_deque.h
/usr/local/include/c++/4.6.0/bits/stl_function.h
/usr/local/include/c++/4.6.0/bits/stl_heap.h
/usr/local/include/c++/4.6.0/bits/stl_iterator.h
/usr/local/include/c++/4.6.0/bits/stl_iterator_base_funcs.h
/usr/local/include/c++/4.6.0/bits/stl_iterator_base_types.h
/usr/local/include/c++/4.6.0/bits/stl_list.h
/usr/local/include/c++/4.6.0/bits/stl_map.h
/usr/local/include/c++/4.6.0/bits/stl_multimap.h
/usr/local/include/c++/4.6.0/bits/stl_multiset.h
/usr/local/include/c++/4.6.0/bits/stl_numeric.h
/usr/local/include/c++/4.6.0/bits/stl_pair.h
/usr/local/include/c++/4.6.0/bits/stl_queue.h
/usr/local/include/c++/4.6.0/bits/stl_raw_storage_iter.h
/usr/local/include/c++/4.6.0/bits/stl_relops.h
/usr/local/include/c++/4.6.0/bits/stl_set.h
/usr/local/include/c++/4.6.0/bits/stl_stack.h
/usr/local/include/c++/4.6.0/bits/stl_tempbuf.h
/usr/local/include/c++/4.6.0/bits/stl_tree.h
/usr/local/include/c++/4.6.0/bits/stl_uninitialized.h
/usr/local/include/c++/4.6.0/bits/stl_vector.h
/usr/local/include/c++/4.6.0/bits/stream_iterator.h
/usr/local/include/c++/4.6.0/bits/streambuf_iterator.h
/usr/local/include/c++/4.6.0/bits/stringfwd.h
/usr/local/include/c++/4.6.0/bits/unique_ptr.h
/usr/local/include/c++/4.6.0/bits/unordered_map.h
/usr/local/include/c++/4.6.0/bits/unordered_set.h
/usr/local/include/c++/4.6.0/bits/valarray_after.h
/usr/local/include/c++/4.6.0/bits/valarray_array.h
/usr/local/include/c++/4.6.0/bits/valarray_before.h
/usr/local/include/c++/4.6.0/complex.h
/usr/local/include/c++/4.6.0/cxxabi.h
/usr/local/include/c++/4.6.0/debug/debug.h
/usr/local/include/c++/4.6.0/debug/formatter.h
/usr/local/include/c++/4.6.0/debug/functions.h
/usr/local/include/c++/4.6.0/debug/macros.h
/usr/local/include/c++/4.6.0/debug/map.h
/usr/local/include/c++/4.6.0/debug/multimap.h
/usr/local/include/c++/4.6.0/debug/multiset.h
/usr/local/include/c++/4.6.0/debug/safe_base.h
/usr/local/include/c++/4.6.0/debug/safe_iterator.h
/usr/local/include/c++/4.6.0/debug/safe_sequence.h
/usr/local/include/c++/4.6.0/debug/set.h
/usr/local/include/c++/4.6.0/decimal/decimal.h
/usr/local/include/c++/4.6.0/ext/array_allocator.h
/usr/local/include/c++/4.6.0/ext/atomicity.h
/usr/local/include/c++/4.6.0/ext/bitmap_allocator.h
/usr/local/include/c++/4.6.0/ext/cast.h
/usr/local/include/c++/4.6.0/ext/codecvt_specializations.h
/usr/local/include/c++/4.6.0/ext/concurrence.h
/usr/local/include/c++/4.6.0/ext/debug_allocator.h
/usr/local/include/c++/4.6.0/ext/enc_filebuf.h
/usr/local/include/c++/4.6.0/ext/extptr_allocator.h
/usr/local/include/c++/4.6.0/ext/malloc_allocator.h
/usr/local/include/c++/4.6.0/ext/mt_allocator.h
/usr/local/include/c++/4.6.0/ext/new_allocator.h
/usr/local/include/c++/4.6.0/ext/numeric_traits.h
/usr/local/include/c++/4.6.0/ext/pod_char_traits.h
/usr/local/include/c++/4.6.0/ext/pointer.h
/usr/local/include/c++/4.6.0/ext/pool_allocator.h
/usr/local/include/c++/4.6.0/ext/rc_string_base.h
/usr/local/include/c++/4.6.0/ext/ropeimpl.h
/usr/local/include/c++/4.6.0/ext/sso_string_base.h
/usr/local/include/c++/4.6.0/ext/stdio_filebuf.h
/usr/local/include/c++/4.6.0/ext/stdio_sync_filebuf.h
/usr/local/include/c++/4.6.0/ext/string_conversions.h
/usr/local/include/c++/4.6.0/ext/throw_allocator.h
/usr/local/include/c++/4.6.0/ext/type_traits.h
/usr/local/include/c++/4.6.0/ext/typelist.h
/usr/local/include/c++/4.6.0/ext/vstring.h
/usr/local/include/c++/4.6.0/ext/vstring_fwd.h
/usr/local/include/c++/4.6.0/ext/vstring_util.h
/usr/local/include/c++/4.6.0/fenv.h
/usr/local/include/c++/4.6.0/parallel/algo.h
/usr/local/include/c++/4.6.0/parallel/algobase.h
/usr/local/include/c++/4.6.0/parallel/algorithmfwd.h
/usr/local/include/c++/4.6.0/parallel/balanced_quicksort.h
/usr/local/include/c++/4.6.0/parallel/base.h
/usr/local/include/c++/4.6.0/parallel/basic_iterator.h
/usr/local/include/c++/4.6.0/parallel/checkers.h
/usr/local/include/c++/4.6.0/parallel/compatibility.h
/usr/local/include/c++/4.6.0/parallel/compiletime_settings.h
/usr/local/include/c++/4.6.0/parallel/equally_split.h
/usr/local/include/c++/4.6.0/parallel/features.h
/usr/local/include/c++/4.6.0/parallel/find.h
/usr/local/include/c++/4.6.0/parallel/find_selectors.h
/usr/local/include/c++/4.6.0/parallel/for_each.h
/usr/local/include/c++/4.6.0/parallel/for_each_selectors.h
/usr/local/include/c++/4.6.0/parallel/iterator.h
/usr/local/include/c++/4.6.0/parallel/list_partition.h
/usr/local/include/c++/4.6.0/parallel/losertree.h
/usr/local/include/c++/4.6.0/parallel/merge.h
/usr/local/include/c++/4.6.0/parallel/multiseq_selection.h
/usr/local/include/c++/4.6.0/parallel/multiway_merge.h
/usr/local/include/c++/4.6.0/parallel/multiway_mergesort.h
/usr/local/include/c++/4.6.0/parallel/numericfwd.h
/usr/local/include/c++/4.6.0/parallel/omp_loop.h
/usr/local/include/c++/4.6.0/parallel/omp_loop_static.h
/usr/local/include/c++/4.6.0/parallel/par_loop.h
/usr/local/include/c++/4.6.0/parallel/parallel.h
/usr/local/include/c++/4.6.0/parallel/partial_sum.h
/usr/local/include/c++/4.6.0/parallel/partition.h
/usr/local/include/c++/4.6.0/parallel/queue.h
/usr/local/include/c++/4.6.0/parallel/quicksort.h
/usr/local/include/c++/4.6.0/parallel/random_number.h
/usr/local/include/c++/4.6.0/parallel/random_shuffle.h
/usr/local/include/c++/4.6.0/parallel/search.h
/usr/local/include/c++/4.6.0/parallel/set_operations.h
/usr/local/include/c++/4.6.0/parallel/settings.h
/usr/local/include/c++/4.6.0/parallel/sort.h
/usr/local/include/c++/4.6.0/parallel/tags.h
/usr/local/include/c++/4.6.0/parallel/types.h
/usr/local/include/c++/4.6.0/parallel/unique_copy.h
/usr/local/include/c++/4.6.0/parallel/workstealing.h
/usr/local/include/c++/4.6.0/profile/base.h
/usr/local/include/c++/4.6.0/profile/impl/profiler.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_algos.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_container_size.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_hash_func.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_hashtable_size.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_list_to_slist.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_list_to_vector.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_map_to_unordered_map.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_node.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_state.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_trace.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_vector_size.h
/usr/local/include/c++/4.6.0/profile/impl/profiler_vector_to_list.h
/usr/local/include/c++/4.6.0/profile/iterator_tracker.h
/usr/local/include/c++/4.6.0/profile/map.h
/usr/local/include/c++/4.6.0/profile/multimap.h
/usr/local/include/c++/4.6.0/profile/multiset.h
/usr/local/include/c++/4.6.0/profile/set.h
/usr/local/include/c++/4.6.0/tgmath.h
/usr/local/include/c++/4.6.0/tr1/complex.h
/usr/local/include/c++/4.6.0/tr1/ctype.h
/usr/local/include/c++/4.6.0/tr1/fenv.h
/usr/local/include/c++/4.6.0/tr1/float.h
/usr/local/include/c++/4.6.0/tr1/functional_hash.h
/usr/local/include/c++/4.6.0/tr1/hashtable.h
/usr/local/include/c++/4.6.0/tr1/hashtable_policy.h
/usr/local/include/c++/4.6.0/tr1/inttypes.h
/usr/local/include/c++/4.6.0/tr1/limits.h
/usr/local/include/c++/4.6.0/tr1/math.h
/usr/local/include/c++/4.6.0/tr1/random.h
/usr/local/include/c++/4.6.0/tr1/shared_ptr.h
/usr/local/include/c++/4.6.0/tr1/special_function_util.h
/usr/local/include/c++/4.6.0/tr1/stdarg.h
/usr/local/include/c++/4.6.0/tr1/stdbool.h
/usr/local/include/c++/4.6.0/tr1/stdint.h
/usr/local/include/c++/4.6.0/tr1/stdio.h
/usr/local/include/c++/4.6.0/tr1/stdlib.h
/usr/local/include/c++/4.6.0/tr1/tgmath.h
/usr/local/include/c++/4.6.0/tr1/unordered_map.h
/usr/local/include/c++/4.6.0/tr1/unordered_set.h
/usr/local/include/c++/4.6.0/tr1/wchar.h
/usr/local/include/c++/4.6.0/tr1/wctype.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/atomic_word.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/basic_file.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/c++allocator.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/c++config.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/c++io.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/c++locale.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/cpu_defines.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/ctype_base.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/ctype_inline.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/ctype_noninline.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/cxxabi_tweaks.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/error_constants.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/extc++.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/gthr-default.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/gthr-posix.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/gthr-single.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/gthr-tpf.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/gthr.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/messages_members.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/os_defines.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/stdc++.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/stdtr1c++.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/bits/time_members.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/atomic_word.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/basic_file.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/c++allocator.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/c++config.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/c++io.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/c++locale.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/cpu_defines.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/ctype_base.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/ctype_inline.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/ctype_noninline.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/cxxabi_tweaks.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/error_constants.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/extc++.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/gthr-default.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/gthr-posix.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/gthr-single.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/gthr-tpf.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/gthr.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/messages_members.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/os_defines.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/stdc++.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/stdtr1c++.h
/usr/local/include/c++/4.6.0/x86_64-apple-darwin10.7.0/i386/bits/time_members.h
/usr/local/include/gmp.h
/usr/local/include/mpc.h
/usr/local/include/mpf2mpfr.h
/usr/local/include/mpfr.h
Warning: Unbrewed .la files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected .la files:
/usr/local/lib/libgfortran.la
/usr/local/lib/libgmp.la
/usr/local/lib/libgomp.la
/usr/local/lib/libmpc.la
/usr/local/lib/libmpfr.la
/usr/local/lib/libquadmath.la
/usr/local/lib/libssp.la
/usr/local/lib/libssp_nonshared.la
/usr/local/lib/libstdc++.la
/usr/local/lib/libsupc++.la
Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected static libraries:
/usr/local/lib/libgfortran.a
/usr/local/lib/libgmp.a
/usr/local/lib/libgomp.a
/usr/local/lib/libiberty.a
/usr/local/lib/libmpc.a
/usr/local/lib/libmpfr.a
/usr/local/lib/libquadmath.a
/usr/local/lib/libssp.a
/usr/local/lib/libssp_nonshared.a
/usr/local/lib/libstdc++.a
/usr/local/lib/libsupc++.a
在google上搜索后，我发现这些警告与ruby on rails的安装过程无关（我猜是这样的：/）。然后我把$ gem install rails -v 4.2.0这个命令在终端上显示以下错误
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/Users/ankushkushwaha/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20150411-31116-lxsk7p.rb extconf.rb
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using packaged libraries.
checking for gzdopen() in -lz... yes
checking for iconv... yes
************************************************************************
IMPORTANT NOTICE:
Building Nokogiri with a packaged version of libxml2-2.9.2
with the following patches applied:
- 0001-Revert-Missing-initialization-for-the-catalog-module.patch
- 0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch
Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:
gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]
If you are using Bundler, tell it to use the option:
bundle config build.nokogiri --use-system-libraries
bundle install
Note, however, that nokogiri is not fully compatible with arbitrary
versions of libxml2 provided by OS/package vendors.
************************************************************************
Extracting libxml2-2.9.2.tar.gz into tmp/x86_64-apple-darwin14.0.0/ports/libxml2/2.9.2... OK
Running patch with /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxml2/0001-Revert-Missing-initialization-for-the-catalog-module.patch...
Running 'patch' for libxml2 2.9.2... OK
Running patch with /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ports/patches/libxml2/0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch...
Running 'patch' for libxml2 2.9.2... OK
Running 'configure' for libxml2 2.9.2... ERROR, review '/Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2/ext/nokogiri/tmp/x86_64-apple-darwin14.0.0/ports/libxml2/2.9.2/configure.log' to see what happened.
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/ankushkushwaha/.rbenv/versions/2.2.1/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
/Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/mini_portile-0.6.2/lib/mini_portile.rb:279:in `block in execute': Failed to complete configure task (RuntimeError)
from /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/mini_portile-0.6.2/lib/mini_portile.rb:271:in `chdir'
from /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/mini_portile-0.6.2/lib/mini_portile.rb:271:in `execute'
from /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/mini_portile-0.6.2/lib/mini_portile.rb:66:in `configure'
from /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/mini_portile-0.6.2/lib/mini_portile.rb:109:in `cook'
from extconf.rb:278:in `block in process_recipe'
from extconf.rb:177:in `tap'
from extconf.rb:177:in `process_recipe'
from extconf.rb:475:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2 for inspection.
Results logged to /Users/ankushkushwaha/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-14/2.2.0-static/nokogiri-1.6.6.2/gem_make.out
我也安装了Xcode6.3和命令行工具。我无法理解为什么这个错误会持续存在。我是ruby on rails的新手，只想学习这项技术。这是我第一次在Mac上安装它。我是新手。请大家，如果有人能在这种情况下帮助我，我真的会感激我的心底:)。 在youtube tutorial中做同样事情的人没有错误。
PS ：当我开始按照教程在rails上安装ruby时，我得到了xcode 6.1。我在xcode 6.1上安装了命令行工具。之后我看到了这个错误并将我的xcode从6.1更新到6.3。我还从苹果网站再次安装了xcode6.3的命令行工具。我认为这个错误是因为xcode 6.1但它是没用的。 ：（