问题描述
升级到雪豹后，我发现安装一些gem不再起作用，包括webrat，mechanize等.每次我都收到这个错误:
After upgrading to Snow Leopard, I found that installing some gems no longer worked, including webrat, mechanize etc. Each time I get this error:
checking for xmlParseDoc() in -lxml2... no
libxml2 is missing. try 'port install libxml2' or 'yum install libxml2'
*** 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.
不，我没有尝试使用 macports 安装它，因为几年前我发现我无法轻松降级/管理端口时，我放弃了 macports.从那时起，我已经非常习惯于手工从源代码构建，这是我第一次遇到超出我知识范围的东西.我愿意被说服回到 macports，但前提是我缺少简单的解决方案.
And no, I haven't tried installing it with macports, because I forswore macports a couple years back when I discovered I couldn't easily downgrade/manage ports. Since then, I have become very comfortable building from source by hand, and this is the first time I've run into something beyond my ken. I am willing to be persuaded to go back to macports, but only if there's no easy solution to this I am missing.
libxml2 似乎并没有真正丢失，也许只是过时了?...
It doesn't appear that libxml2 is actually missing, just out of date perhaps?...
扩展输出
ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
checking for iconv.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2... yes
checking for libxml/parser.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2... yes
checking for libxslt/xslt.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2... yes
checking for libexslt/exslt.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2... yes
checking for xmlParseDoc() in -lxml2... no
libxml2 is missing. try 'port install libxml2' or 'yum install libxml2'
*** 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=/usr/local/bin/ruby
--with-iconv-dir
--without-iconv-dir
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-dir}/lib
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-xslt-dir
--without-xslt-dir
--with-xslt-include
--without-xslt-include=${xslt-dir}/include
--with-xslt-lib
--without-xslt-lib=${xslt-dir}/lib
--with-xml2lib
--without-xml2lib
Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.1/ext/nokogiri/gem_make.out
推荐答案
更新
正如另一个答案中所述，以下解决方案是矫枉过正"，因为它会从您的系统中删除 MacPorts，我认为我之前已经这样做了.小心进行.可能有一种方法可以使用 MacPorts 来更新 libxml2 安装.
As stated in another answer, the below solution is 'overkill' because it removes MacPorts from your system, which I thought I had already done earlier. Proceed carefully. There may be a way to use MacPorts to just update the libxml2 install.
我解决了这个问题(至少在我的机器上).
I solved this problem (on my machine at least).
一旦我意识到该跟踪中没有任何内容表明缺少 libxml2，而是检测到的版本存在问题，我环顾四周以确认这一事实.果然，nokogiri 网站(许多类似的错误报告指出我)毫不含糊地声明Snow Leopard 附带了一个运行良好的 libxml2 版本.
Once I realized that nothing in that trace suggested the lack of libxml2, but rather a problem with the version being detected, I looked around for confirmation of this fact. Sure enough, the nokogiri website (where many similar bug reports pointed me) states in no uncertain terms that Snow Leopard ships with a good working version of libxml2.
因此，我推断我一定是很久以前通过其他方式安装了一个版本.如果我是手动安装的，我会记得，所以真的只剩下一个选项，frickin'macports.
Thus, I reasoned that I must have installed a version by another means long ago. I would remember if I had installed by hand, so there was really only one option left, frickin' macports.
$ libxml2-2.7.1 tfwright$ sudo find / -type d -name "libxml2"
find: /dev/fd/3: Not a directory
find: /dev/fd/4: Not a directory
/Developer/SDKs/MacOSX10.4u.sdk/usr/include/libxml2
/Developer/SDKs/MacOSX10.5.sdk/usr/include/libxml2
/Developer/SDKs/MacOSX10.6.sdk/usr/include/libxml2
/opt/local/include/libxml2
/opt/local/share/gtk-doc/html/libxml2
/opt/local/var/macports/distfiles/libxml2
/opt/local/var/macports/receipts/libxml2
/opt/local/var/macports/software/libxml2
/opt/local/var/macports/software/libxml2/2.6.30_0/opt/local/include/libxml2
/opt/local/var/macports/software/libxml2/2.6.30_0/opt/local/share/gtk-doc/html/libxml2
/opt/local/var/macports/sources/rsync.macports.org/release/ports/textproc/libxml2
/usr/include/libxml2
/usr/share/gtk-doc/html/libxml2
Son of a...只是吹走我首先尝试的 /opt/local/var/macports，似乎并没有解决问题，所以我去了 大炮.
Son of a...just blowing away /opt/local/var/macports, which I tried first of all, didn't seem to fix the problem, so I went to the big guns.
sudo rm -rf
/opt/local
/Applications/DarwinPorts
/Applications/MacPorts
/Library/LaunchDaemons/org.macports.*
/Library/Receipts/DarwinPorts*.pkg
/Library/Receipts/MacPorts*.pkg
/Library/StartupItems/DarwinPortsStartup
/Library/Tcl/darwinports1.0
/Library/Tcl/macports1.0
~/.macports
之后，一切安装正常.那就对了.永远不要相信错误消息的建议！我不需要用 macports 重新安装 libxml2，我需要从我的系统中清除所有 macports 的痕迹，这让我在垃圾堆之外一直困扰着我.
After which, everything installs fine. that's right. Never trust the recommendations of error messages! Far from needing to reinstall libxml2 with macports, I needed to scrub away all traces of macports from my system, which was haunting me from beyond the trash.
这篇关于在 Snow Leopard - libxml2 上安装一些 gem 时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！