首先系统是centos 6.5：

uname -a
Linux n0 2.6.32-504.3.3.el6.x86_64 #1 SMP Wed Dec 17 01:55:02 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

R成功装上，R是3.1.2的，但遇到了三个问题：
1. install.packages()的时候每次都要选mirror, 而且我发现R的文件夹里面没有Rprofile.site让我配置options(),于是我自己照着安装在windows上的R的etc文件夹里的Rprofile.site自己在CentOS的R安装文件夹里建了一个，发现不起作用
如何设置，才能避免每次都选mirror?

2. 装reshape,OK,但装有的包的时候不OK，例如ggplot2，错误如下

 Selection: 1
also installing the dependencies ‘colorspace’, ‘stringr’, ‘RColorBrewer’, ‘dichromat’, ‘munsell’, ‘labeling’, ‘digest’, ‘gtable’, ‘reshape2’, ‘scales’, ‘proto’

trying URL 'http://cran.rstudio.com/src/contrib/colorspace_1.2-5.tar.gz'
Content type 'application/x-gzip' length 246898 bytes (241 Kb)
opened URL
==================================================
downloaded 241 Kb

trying URL 'http://cran.rstudio.com/src/contrib/stringr_0.6.2.tar.gz'
Content type 'application/x-gzip' length 20636 bytes (20 Kb)
opened URL
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downloaded 20 Kb

trying URL 'http://cran.rstudio.com/src/contrib/RColorBrewer_1.1-2.tar.gz'
Content type 'application/x-gzip' length 11532 bytes (11 Kb)
opened URL
==================================================
downloaded 11 Kb

trying URL 'http://cran.rstudio.com/src/contrib/dichromat_2.0-0.tar.gz'
Content type 'application/x-gzip' length 84320 bytes (82 Kb)
opened URL
==================================================
downloaded 82 Kb

trying URL 'http://cran.rstudio.com/src/contrib/munsell_0.4.2.tar.gz'
Content type 'application/x-gzip' length 91026 bytes (88 Kb)
opened URL
==================================================
downloaded 88 Kb

trying URL 'http://cran.rstudio.com/src/contrib/labeling_0.3.tar.gz'
Content type 'application/x-gzip' length 10722 bytes (10 Kb)
opened URL
==================================================
downloaded 10 Kb

trying URL 'http://cran.rstudio.com/src/contrib/digest_0.6.8.tar.gz'
Content type 'application/x-gzip' length 97985 bytes (95 Kb)
opened URL
==================================================
downloaded 95 Kb

trying URL 'http://cran.rstudio.com/src/contrib/gtable_0.1.2.tar.gz'
Content type 'application/x-gzip' length 19667 bytes (19 Kb)
opened URL
==================================================
downloaded 19 Kb

trying URL 'http://cran.rstudio.com/src/contrib/reshape2_1.4.1.tar.gz'
Content type 'application/x-gzip' length 34693 bytes (33 Kb)
opened URL
==================================================
downloaded 33 Kb

trying URL 'http://cran.rstudio.com/src/contrib/scales_0.2.4.tar.gz'
Content type 'application/x-gzip' length 40093 bytes (39 Kb)
opened URL
==================================================
downloaded 39 Kb

trying URL 'http://cran.rstudio.com/src/contrib/proto_0.3-10.tar.gz'
Content type 'application/x-gzip' length 530758 bytes (518 Kb)
opened URL
==================================================
downloaded 518 Kb

trying URL 'http://cran.rstudio.com/src/contrib/ggplot2_1.0.0.tar.gz'
Content type 'application/x-gzip' length 2351447 bytes (2.2 Mb)
opened URL
==================================================
downloaded 2.2 Mb

* installing *source* package ‘colorspace’ ...
** package ‘colorspace’ successfully unpacked and MD5 sums checked
** libs
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c colorspace.c -o colorspace.o
gcc -std=gnu99 -shared -L/usr/local/lib64 -o colorspace.so colorspace.o
installing to /usr/local/lib64/R/library/colorspace/libs
** R
** data
*** moving datasets to lazyload DB
** inst
** preparing package for lazy loading
Warning: S3 methods ‘as.character.tclObj’, ‘as.character.tclVar’, ‘as.double.tclObj’, ‘as.integer.tclObj’, ‘as.logical.tclObj’, ‘as.raw.tclObj’, ‘print.tclObj’, ‘[[.tclArray’, ‘[[<-.tclArray’, ‘$.tclArray’, ‘$<-.tclArray’, ‘names.tclArray’, ‘names<-.tclArray’, ‘length.tclArray’, ‘length<-.tclArray’, ‘tclObj.tclVar’, ‘tclObj<-.tclVar’, ‘tclvalue.default’, ‘tclvalue.tclObj’, ‘tclvalue.tclVar’, ‘tclvalue<-.default’, ‘tclvalue<-.tclVar’, ‘close.tkProgressBar’ were declared in NAMESPACE but not found
Error : .onLoad failed in loadNamespace() for 'tcltk', details:
  call: fun(libname, pkgname)
  error: Tcl/Tk support is not available on this system
ERROR: lazy loading failed for package ‘colorspace’
* removing ‘/usr/local/lib64/R/library/colorspace’
* installing *source* package ‘stringr’ ...
** package ‘stringr’ successfully unpacked and MD5 sums checked
** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (stringr)
* installing *source* package ‘RColorBrewer’ ...
** package ‘RColorBrewer’ successfully unpacked and MD5 sums checked
** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (RColorBrewer)
* installing *source* package ‘dichromat’ ...
** package ‘dichromat’ successfully unpacked and MD5 sums checked
** R
** data
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (dichromat)
* installing *source* package ‘labeling’ ...
** package ‘labeling’ successfully unpacked and MD5 sums checked
** R
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (labeling)
* installing *source* package ‘digest’ ...
** package ‘digest’ successfully unpacked and MD5 sums checked
** libs
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c aes.c -o aes.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c crc32.c -o crc32.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c digest.c -o digest.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c init.c -o init.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c md5.c -o md5.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c pmurhash.c -o pmurhash.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c raes.c -o raes.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c sha1.c -o sha1.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c sha2.c -o sha2.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c sha256.c -o sha256.o
gcc -std=gnu99 -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include    -fpic  -g -O2  -c xxhash.c -o xxhash.o
gcc -std=gnu99 -shared -L/usr/local/lib64 -o digest.so aes.o crc32.o digest.o init.o md5.o pmurhash.o raes.o sha1.o sha2.o sha256.o xxhash.o
installing to /usr/local/lib64/R/library/digest/libs
** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (digest)
* installing *source* package ‘gtable’ ...
** package ‘gtable’ successfully unpacked and MD5 sums checked
** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (gtable)
* installing *source* package ‘proto’ ...
** package ‘proto’ successfully unpacked and MD5 sums checked
** R
** demo
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** installing vignettes
   ‘proto.Rnw’ 
   ‘protoref.Rnw’ 
** testing if installed package can be loaded
* DONE (proto)
ERROR: dependency ‘colorspace’ is not available for package ‘munsell’
* removing ‘/usr/local/lib64/R/library/munsell’
* installing *source* package ‘reshape2’ ...
** package ‘reshape2’ successfully unpacked and MD5 sums checked
** libs
g++ -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include -I"/usr/local/lib64/R/library/Rcpp/include"   -fpic  -g -O2  -c RcppExports.cpp -o RcppExports.o
g++ -I/usr/local/lib64/R/include -DNDEBUG  -I/usr/local/include -I"/usr/local/lib64/R/library/Rcpp/include"   -fpic  -g -O2  -c melt.cpp -o melt.o
g++ -shared -L/usr/local/lib64 -o reshape2.so RcppExports.o melt.o
installing to /usr/local/lib64/R/library/reshape2/libs
** R
** data
*** moving datasets to lazyload DB
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (reshape2)
ERROR: dependency ‘munsell’ is not available for package ‘scales’
* removing ‘/usr/local/lib64/R/library/scales’
ERROR: dependency ‘scales’ is not available for package ‘ggplot2’
* removing ‘/usr/local/lib64/R/library/ggplot2’

The downloaded source packages are in
	‘/tmp/RtmppCig3q/downloaded_packages’
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done
Warning messages:
1: In install.packages("ggplot2") :
  installation of package ‘colorspace’ had non-zero exit status
2: In install.packages("ggplot2") :
  installation of package ‘munsell’ had non-zero exit status
3: In install.packages("ggplot2") :
  installation of package ‘scales’ had non-zero exit status
4: In install.packages("ggplot2") :
  installation of package ‘ggplot2’ had non-zero exit status
> 350*0.2
[1] 70
> library(ggplot2)
Error in library(ggplot2) : there is no package called ‘ggplot2’</code?
为什么呢？

3. 图形设备无法启用：
<code>> png()
Error in .External2(C_X11, paste("png::", filename, sep = ""), g$width,  : 
  unable to start device PNG
In addition: Warning message:
In png() : no png support in this version of R