Mac user and getting WARNING: Nokogiri was built against LibXML version 2.7.8, but has dynamically loaded 2.7.3

Question

I have done all kinds of research and tried many different things. I know this question has been answered many times, but none of the suggested solutions are working for me.

Answer 1

gem uninstall nokogiri
bundle  #install nokogiri again

If that fails with "libxml2 is missing." and you see gems/nokogiri-1.5.0/ext/nokogiri/mkmf.log trying to use "/usr/bin/gcc-4.2 ...", then you're missing /usr/bin/gcc-4.2

Solution:

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

Before:

$ ll /usr/bin/gcc*
lrwxr-xr-x  1 root  wheel  12 Jan 15 00:16 /usr/bin/gcc -> llvm-gcc-4.2

After:

$ ll /usr/bin/gcc*
lrwxr-xr-x  1 root  wheel  12 Jan 15 00:16 /usr/bin/gcc -> llvm-gcc-4.2
lrwxr-xr-x  1 root  wheel  12 Jan 15 21:07 /usr/bin/gcc-4.2 -> /usr/bin/gcc

If you're really missing libxml2 libxslt, then

brew update
brew install libxml2 libxslt
brew link libxml2 libxslt
bundle config build.nokogiri --with-xml2-include=/usr/local/Cellar/libxml2/2.8.0/include/libxml2/ --with-xml2-lib=/usr/local/Cellar/libxml2/2.8.0/lib/ --with-xslt-dir=/usr/local/Cellar/libxslt/1.1.26/
bundle

FYI: I'm running Mountain Lion with brew, and bundler.