当我尝试在CENTOS上的R中安装xml包时，我收到了这样的警告：
> install.packages("XML")
Installing package into ‘/opt/wpusers/r-mkosinski/R/x86_64-redhat-linux-gnu-library/3.1’
(as ‘lib’ is unspecified)
trying URL 'http://cran.rstudio.com/src/contrib/XML_3.98-1.1.tar.gz'
Content type 'application/x-gzip' length 1582216 bytes (1.5 Mb)
opened URL
==================================================
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...
rm: cannot remove 'a.out.dSYM': Is a directory
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/bin/sed
checking for pkg-config... /bin/pkg-config
checking for xml2-config... no
Cannot find xml2-config
ERROR: configuration failed for package ‘XML’
* removing ‘/opt/wpusers/r-mkosinski/R/x86_64-redhat-linux-gnu-library/3.1/XML’
Warning in install.packages :
installation of package ‘XML’ had non-zero exit status
The downloaded source packages are in
‘/tmp/Rtmp3rqP3n/downloaded_packages’
>
我的会话信息是：
> session_info()
Session info --------------------------------------------------------------------
setting value
version R version 3.1.2 (2014-10-31)
system x86_64, linux-gnu
ui RStudio (0.98.1091)
language (EN)
collate en_US.UTF-8
tz Europe/Warsaw
Packages ------------------------------------------------------------------------
package * version date source
archivist 1.2 2015-02-12 Github (pbiecek/archivist@d5305be)
assertthat * 0.1 2013-12-06 CRAN (R 3.1.2)
bitops * 1.0-6 2013-08-17 CRAN (R 3.1.2)
DBI 0.3.1 2014-09-24 CRAN (R 3.1.2)
devtools 1.7.0 2015-01-17 CRAN (R 3.1.2)
digest * 0.6.8 2014-12-31 CRAN (R 3.1.2)
dplyr 0.4.0 2015-01-08 CRAN (R 3.1.2)
htmltools * 0.2.6 2014-09-08 CRAN (R 3.1.2)
httpuv * 1.3.2 2014-10-23 CRAN (R 3.1.2)
httr * 0.6.1 2015-01-01 CRAN (R 3.1.2)
lubridate 1.3.3 2013-12-31 CRAN (R 3.1.2)
magrittr * 1.5 2014-11-22 CRAN (R 3.1.2)
memoise * 0.2.1 2014-04-22 CRAN (R 3.1.2)
mime * 0.2 2014-09-26 CRAN (R 3.1.2)
pbapply 1.1-1 2014-05-16 CRAN (R 3.1.2)
plyr * 1.8.1 2014-02-26 CRAN (R 3.1.2)
R6 * 2.0.1 2014-10-29 CRAN (R 3.1.2)
Rcpp * 0.11.3 2014-09-29 CRAN (R 3.1.2)
RCurl * 1.95-4.5 2014-12-28 CRAN (R 3.1.2)
RJSONIO * 1.3-0 2014-07-28 CRAN (R 3.1.2)
RSQLite 1.0.0 2014-10-25 CRAN (R 3.1.2)
rstudio * 0.98.1091 2015-01-19 local
rstudioapi * 0.2 2014-12-31 CRAN (R 3.1.2)
shiny 0.10.2.2 2014-12-08 CRAN (R 3.1.2)
stringi 0.4-1 2014-12-14 CRAN (R 3.1.2)
stringr * 0.6.2 2012-12-06 CRAN (R 3.1.2)
xtable * 1.7-4 2014-09-12 CRAN (R 3.1.2)
也许这是R版本的问题？
答案 0 :(得分：10)
输出中有两个明确说明的问题：
a.out/：checking for C compiler default output file name... rm: cannot remove 'a.out.dSYM': Is a directory a.out checking whether the C compiler works... yes
checking for xml2-config... no Cannot find xml2-config
如果没有libxml2-dev提供的XML开发工具，您就无法从源代码构建软件包。
答案 1 :(得分：1)
如果您使用的是Fedora，CentOs或RedHat，则需要安装libxml2-devel。
dnf install libxml2-devel
答案 2 :(得分：1)
在Centos 7的命令行上安装sudo yum install libxml2-devel
然后install.packages（“XML”）
答案 3 :(得分：0)
如果在ubuntu上：
sudo apt-get install libxml2-dev