快速链接bioconductor，以及安装“XML”

 options(useHTTPS=FALSE, BioC_mirror="http://bioconductor.org")

 source("http://bioconductor.org/biocLite.R")

install.packages("XML")

trying URL 'https://cloud.r-project.org/src/contrib/XML_3.98-1.4.tar.gz'
Content type 'application/x-gzip' length 1599214 bytes (1.5 MB)
==================================================
downloaded 1.5 MB

* installing *source* package ‘XML’ ...
** package ‘XML’ successfully unpacked and MD5 sums checked
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... gcc -E
checking for sed... /usr/local/Library/ENV/4.3/sed
checking for pkg-config... /usr/local/bin/pkg-config
checking for xml2-config... /Users/richiethomas/anaconda/bin/xml2-config
USE_XML2 = yes
SED_EXTENDED_ARG: -E
Minor 9, Patch 2 for 2.9.2
Located parser file -I/Users/richiethomas/anaconda/include/libxml2/parser.h
Checking for 1.8:  -I/Users/richiethomas/anaconda/include/libxml2
Using libxml2.*
checking for gzopen in -lz... yes
checking for xmlParseFile in -lxml2... yes
You are trying to use a version 2.* edition of libxml
but an incompatible library. The header files and library seem to be
mismatched. If you have specified LIBXML_INCDIR, make certain to also
specify an appropriate LIBXML_LIBDIR if the libxml2 library is not in the default
directories.
ERROR: configuration failed for package ‘XML’
* removing ‘/usr/local/lib/R/3.2/site-library/XML’

The downloaded source packages are in
    ‘/private/var/folders/jy/0cwn40p951xc7f1480z3sxzm0000gn/T/RtmpvWMrkH/downloaded_packages’
Warning message:
In install.packages("XML") :
  installation of package ‘XML’ had non-zero exit status

　　出现上述报错，的快速解决方法如下

 conda install -c r r-xml

若继续出现下面错误：

/bin/sh: /root/anaconda2/bin/x86_64-conda_cos6-linux-gnu-gcc: No such file or directory

 conda install gxx_linux-

 provides x86_64-conda_cos6-linux-gnu-c++

 conda install gcc_linux-
 conda install gxx_linux-

 conda install gfortran_linux-
 conda install -c tsnyder gfortran_linux-cos6-x86_64