[BioC] help in downloading some packages.

Michael Dondrup Michael.Dondrup at uni.no
Thu Oct 7 14:30:46 CEST 2010

> * Installing *source* package 'XML' ...
> 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... /bin/sed
> checking for pkg-config... /usr/bin/pkg-config
> checking for xml2-config... no
> Cannot find xml2-config
> ERROR: configuration failed for package 'XML'
> ** Removing '/home/veerendra/R/i486-pc-linux-gnu-library/2.8/XML'
> * Installing *source* package 'AnnotationDbi' ...

you cannot install package XML which is a dependency of other packages, because you need libxml2
I guess you are using red-hat, centos or smth, you didn't give the sessionInfo().
Install libxml2 and libxml2-devel using your package manager, aka.:
# yum install libxml2 libxml2-devel 
or apt-get install ^^ on debian  

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