当我在Rails项目文件夹中执行以下命令时：
gem install bson_ext
我收到这个错误：
#result
Building native extensions. This could take a while...
ERROR: Error installing bson_ext:
ERROR: Failed to build gem native extension.
/home/absolute/.rvm/rubies/ruby-1.9.3-p0/bin/ruby extconf.rb
checking for asprintf()... yes
checking for ruby/st.h... yes
checking for ruby/regex.h... yes
checking for ruby/encoding.h... yes
creating Makefile
make
compiling bson_buffer.c
compiling cbson.c
cbson.c: In function ‘write_element’:
cbson.c:439:17: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration- after-statement]
cbson.c: In function ‘write_doc’:
cbson.c:608:5: warning: implicit declaration of function ‘bson_buffer_get_max_size’ [-Wimplicit-function-declaration]
cbson.c: In function ‘objectid_generate’:
cbson.c:911:9: warning: implicit declaration of function ‘htonl’ [-Wimplicit-function-declaration]
cbson.c:919:5: warning: implicit declaration of function ‘htons’ [-Wimplicit-function-declaration]
compiling encoding_helpers.c
linking shared-object bson_ext/cbson.so
make install
/bin/install -c -m 0755 cbson.so /home/absolute/.rvm/gems/ruby-1.9.3-p0/gems/bson_ext-1.6.2/ext/bson_ext
make: /bin/install: Command not found
make: *** [/home/absolute/.rvm/gems/ruby-1.9.3-p0/gems/bson_ext-1.6.2/ext/bson_ext/cbson.so] Error 127
Gem files will remain installed in /home/absolute/.rvm/gems/ruby-1.9.3- p0/gems/bson_ext-1.6.2 for inspection.
Results logged to /home/absolute/.rvm/gems/ruby-1.9.3-p0/gems/bson_ext-1.6.2/ext/cbson/gem_make.out
我在我的Rails项目中使用mongoid。安装bson_ext gem，它给了我上面的错误。
谁能告诉我这是什么问题？
不确定为什么你的make没有使用正确的install。但是快速修复很容易：
sudo ln -s /usr/bin/install /bin/install
这将把现有的安装链接到/bin，并应该启用make。