错误：执行gem时出错...（Gem :: FilePermissionError）

我查看了所有类似的答案，但没有一个完全符合我的情况，也没有任何一种解决方案对我有效。

gem environment 和 sudo gem environment 的结果相同：

RubyGems Environment:
  - RUBYGEMS VERSION: 1.5.3
  - RUBY VERSION: 1.8.7 (2011-12-28 patchlevel 357) [x86_64-linux]
  - INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.8
  - RUBY EXECUTABLE: /usr/local/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /usr/local/lib/ruby/gems/1.8
     - /home/ava/.gem/ruby/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

rvm -v： rvm 1.22.3

ruby -v： ruby 1.8.7

OSX 10.8.4

echo $PATH /usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/ava/.rvm/bin:/home/ava/bin

gem install <gem-name> 的结果为

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions into the /usr/local/lib/ruby/gems/1.8 directory.

我可以通过sudo安装相同的软件，但为什么不能直接安装？我做错了什么吗？

更新：

根据评论和这篇文章，我运行了以下命令：

rvm implode 然后重新安装稳定版本。 rvm install 1.9.3 或其他任何Ruby版本的安装都会失败。

Error running '__rvm_make -j24',
please read /home/ava/.rvm/log/log/1378418790_ruby-1.9.3-p194/make.log
There has been an error while running make. Halting the installation.

make.log

    [2013-09-05 22:06:48] make
current path: /home/ava/.rvm/src/ruby-1.9.3-p194
command(2): make -j24
        CC = gcc
        LD = ld
        LDSHARED = gcc -shared
        CFLAGS = -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Werror-implicit-function-declaration  -fPIC
        XCFLAGS = -include ruby/config.h -include ruby/missing.h -fvisibility=hidden -DRUBY_EXPORT
        CPPFLAGS =   -I. -I.ext/include/x86_64-linux -I./include -I.
        DLDFLAGS = -Wl,-soname,libruby.so.1.9
        SOLIBS = -lpthread -lrt -ldl -lcrypt -lm
compiling main.c
compiling dmydln.c
compiling dmyencoding.c
compiling version.c
compiling miniprelude.c
compiling array.c
compiling bignum.c
compiling class.c
compiling compar.c
compiling complex.c
compiling dir.c
compiling dln_find.c
compiling enum.c
compiling enumerator.c
compiling error.c
compiling eval.c
compiling load.c
compiling proc.c
compiling file.c
:
:
:
In file included from ossl.h:213,
                 from ossl_pkcs5.c:5:
openssl_missing.h:71: error: conflicting types for ‘HMAC_CTX_copy’
/usr/local/include/openssl/hmac.h:102: error: previous declaration of ‘HMAC_CTX_copy’ was here
openssl_missing.h:95: error: conflicting types for ‘EVP_CIPHER_CTX_copy’
/usr/local/include/openssl/evp.h:459: error: previous declaration of ‘EVP_CIPHER_CTX_copy’ was here
make[2]: *** [ossl_pkcs5.o] Error 1
In file included from ossl.h:213,
                 from ossl_x509req.c:11:
:
:
: