为什么我在安装 bson_ext 时会出错？答案

【问题标题】：Why do I get an error installing bson_ext?为什么我在安装 bson_ext 时会出错？
【发布时间】：2012-05-17 08:26:03
【问题描述】：

当我在 Rails 项目文件夹中执行以下命令时：

gem install bson_ext

我得到这个错误：

#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。

谁能告诉我是什么问题？

【问题讨论】：

which install 说什么？ /usr/bin/安装? --echo $PATH呢？
yes...which install 给了我你所说的....并且 echo $PATH 给了：/home/absolute/.rvm/gems/ruby-1.9.3-p0/bin:/ home/absolute/.rvm/gems/ruby-1.9.3-p0@global/bin:/home/absolute/.rvm/rubies/ruby-1.9.3-p0/bin:/home/absolute/.rvm/bin :/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/bin/core_perl:/opt/java/bin:/opt/java/分贝/bin

标签： ruby-on-rails ruby ruby-on-rails-3.1 mongoid bson

【解决方案1】：

如果您使用的是捆绑安装，则需要运行

bundle config build.bson_ext --with-cflags="-Wno-error=implicit-function-declaration"

【讨论】：

【解决方案2】：

不知道为什么您的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

这会将现有安装链接到/bin，并应使make 能够继续。

【讨论】：