Error when installing xml2 package on Mavericks

Question

I'm trying to install devtools package in R, and as its dependency xml2 needs to be installed, but I'm getting the following error message.

> install.packages("xml2")
Installing package into ‘/Users/xlong3/Library/R/3.2/library’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/src/contrib/xml2_0.1.2.tar.gz'
Content type 'application/x-gzip' length 74808 bytes (73 KB)
==================================================
downloaded 73 KB

* installing *source* package ‘xml2’ ...
** package ‘xml2’ successfully unpacked and MD5 sums checked
Found pkg-config cflags and libs!
Using PKG_CFLAGS=-I/Users/xlong3/anaconda/include/libxml2
Using PKG_LIBS=-L/Users/xlong3/anaconda/lib -lxml2 -lz -liconv -lm
** libs
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c RcppExports.cpp -o RcppExports.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c connection.cpp -o connection.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml2_doc.cpp -o xml2_doc.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml2_init.cpp -o xml2_init.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml2_namespace.cpp -o xml2_namespace.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml2_node.cpp -o xml2_node.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml2_url.cpp -o xml2_url.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml2_xpath.cpp -o xml2_xpath.o
clang++ -I/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/include -DNDEBUG -I/Users/xlong3/anaconda/include/libxml2 -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/opt/openssl/include -I"/Users/xlong3/Library/R/3.2/library/Rcpp/include" -I"/usr/local/lib/R/3.2/site-library/BH/include"   -fPIC  -g -O2  -c xml_push.cpp -o xml_push.o
clang++ -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/usr/local/Cellar/r/3.2.2_1/R.framework/Resources/lib -L/usr/local/opt/gettext/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/openssl/lib -o xml2.so RcppExports.o connection.o xml2_doc.o xml2_init.o xml2_namespace.o xml2_node.o xml2_url.o xml2_xpath.o xml_push.o -L/Users/xlong3/anaconda/lib -lxml2 -lz -liconv -lm -F/usr/local/Cellar/r/3.2.2_1/R.framework/.. -framework R -lintl -Wl,-framework -Wl,CoreFoundation
installing to /Users/xlong3/Library/R/3.2/library/xml2/libs
** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
Error in dyn.load(file, DLLpath = DLLpath, ...) : 
  unable to load shared object '/Users/xlong3/Library/R/3.2/library/xml2/libs/xml2.so':
  dlopen(/Users/xlong3/Library/R/3.2/library/xml2/libs/xml2.so, 6): Library not loaded: libxml2.2.dylib
  Referenced from: /Users/xlong3/Library/R/3.2/library/xml2/libs/xml2.so
  Reason: image not found
Error: loading failed
Execution halted
ERROR: loading failed
* removing ‘/Users/xlong3/Library/R/3.2/library/xml2’

The downloaded source packages are in
    ‘/private/tmp/RtmpJc4WKq/downloaded_packages’
Warning message:
In install.packages("xml2") :
  installation of package ‘xml2’ had non-zero exit status
>




> version
               _                           
platform       x86_64-apple-darwin13.4.0   
arch           x86_64                      
os             darwin13.4.0                
system         x86_64, darwin13.4.0                                              
version.string R version 3.2.2 (2015-08-14)
nickname       Fire Safety   

Answer 1

The problem is that 'pkg-config' is looking specifically for 'libxml2.pc' and the file that you have installed is named, "libxml-2.0.pc". If you manually create a symbolic link between the existing file and the one pkg-config expects, it should resolve that error.

Something like this (done in the same directory as the file) should work $ ln -s libxml-2.0.pc libxml2.pc

Answer 2

Try to change your CRAN mirror

Answer 3

I'm not sure how should I proceed from the following situation:

   pkg-config --libs --cflags  libxml2

Package libxml2 was not found in the pkg-config search path. Perhaps you should add the directory containing `libxml2.pc' to the PKG_CONFIG_PATH environment variable No package 'libxml2' found

brew ls libxml2

/usr/local/Cellar/libxml2/2.9.2/bin/xml2-config
/usr/local/Cellar/libxml2/2.9.2/bin/xmlcatalog
/usr/local/Cellar/libxml2/2.9.2/bin/xmllint
/usr/local/Cellar/libxml2/2.9.2/include/libxml2/ (47 files)
/usr/local/Cellar/libxml2/2.9.2/lib/libxml2.2.dylib
/usr/local/Cellar/libxml2/2.9.2/lib/cmake/libxml2/libxml2-config.cmake
/usr/local/Cellar/libxml2/2.9.2/lib/pkgconfig/libxml-2.0.pc
/usr/local/Cellar/libxml2/2.9.2/lib/ (3 other files)
/usr/local/Cellar/libxml2/2.9.2/share/aclocal/libxml.m4
/usr/local/Cellar/libxml2/2.9.2/share/doc/ (153 files)
/usr/local/Cellar/libxml2/2.9.2/share/gtk-doc/ (55 files)
/usr/local/Cellar/libxml2/2.9.2/share/man/ (4 files)