问题
I am trying to install devtools in R version 3.2.1, however when I do the following error is thrown:
Package libxml-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing libxml-2.0.pc
to the PKG_CONFIG_PATH environment variable
when I run dpkg -L libxml2-dev in a terminal I find:
/usr
/usr/bin
/usr/bin/xml2-config
/usr/share
/usr/share/aclocal
/usr/share/aclocal/libxml2.m4
/usr/share/doc
/usr/share/doc/libxml2-dev
/usr/share/doc/libxml2-dev/copyright
/usr/share/man
/usr/share/man/man1
/usr/share/man/man1/xml2-config.1.gz
/usr/share/man/man3
/usr/share/man/man3/libxml.3.gz
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libxml2.a
/usr/lib/x86_64-linux-gnu/pkgconfig
/usr/lib/x86_64-linux-gnu/pkgconfig/libxml-2.0.pc
/usr/lib/x86_64-linux-gnu/xml2Conf.sh
/usr/include
/usr/include/libxml2
/usr/include/libxml2/libxml
/usr/include/libxml2/libxml/globals.h
/usr/include/libxml2/libxml/schematron.h
/usr/include/libxml2/libxml/xlink.h
/usr/include/libxml2/libxml/HTMLparser.h
/usr/include/libxml2/libxml/pattern.h
/usr/include/libxml2/libxml/xmlexports.h
/usr/include/libxml2/libxml/xmlschemas.h
/usr/include/libxml2/libxml/list.h
/usr/include/libxml2/libxml/entities.h
/usr/include/libxml2/libxml/xmlstring.h
/usr/include/libxml2/libxml/encoding.h
/usr/include/libxml2/libxml/hash.h
/usr/include/libxml2/libxml/xmlmemory.h
/usr/include/libxml2/libxml/relaxng.h
/usr/include/libxml2/libxml/xmlsave.h
/usr/include/libxml2/libxml/SAX2.h
/usr/include/libxml2/libxml/xmlIO.h
/usr/include/libxml2/libxml/xmlschemastypes.h
/usr/include/libxml2/libxml/xpathInternals.h
/usr/include/libxml2/libxml/schemasInternals.h
/usr/include/libxml2/libxml/xmlmodule.h
/usr/include/libxml2/libxml/valid.h
/usr/include/libxml2/libxml/c14n.h
/usr/include/libxml2/libxml/xmlwriter.h
/usr/include/libxml2/libxml/tree.h
/usr/include/libxml2/libxml/xmlunicode.h
/usr/include/libxml2/libxml/nanohttp.h
/usr/include/libxml2/libxml/catalog.h
/usr/include/libxml2/libxml/xmlerror.h
/usr/include/libxml2/libxml/nanoftp.h
/usr/include/libxml2/libxml/xmlautomata.h
/usr/include/libxml2/libxml/xinclude.h
/usr/include/libxml2/libxml/HTMLtree.h
/usr/include/libxml2/libxml/chvalid.h
/usr/include/libxml2/libxml/parserInternals.h
/usr/include/libxml2/libxml/xpointer.h
/usr/include/libxml2/libxml/xmlversion.h
/usr/include/libxml2/libxml/dict.h
/usr/include/libxml2/libxml/xmlregexp.h
/usr/include/libxml2/libxml/DOCBparser.h
/usr/include/libxml2/libxml/parser.h
/usr/include/libxml2/libxml/xmlreader.h
/usr/include/libxml2/libxml/SAX.h
/usr/include/libxml2/libxml/threads.h
/usr/include/libxml2/libxml/debugXML.h
/usr/include/libxml2/libxml/xpath.h
/usr/include/libxml2/libxml/uri.h
/usr/share/doc/libxml2-dev/README
/usr/share/doc/libxml2-dev/NEWS.gz
/usr/share/doc/libxml2-dev/AUTHORS
/usr/share/doc/libxml2-dev/TODO.gz
/usr/share/doc/libxml2-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libxml2.so
to try and add this to the PKG_CONFIG_PATH I tried: env PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig however this does not seem to work.
回答1:
OK so in the end I had to manually install libxml2 even though my system said it allready had the most up to date version installed after: sudo apt-get install libxml2 libxml2-dev
I manually installed based on info found here:
wget ftp://xmlsoft.org/libxml2/libxml2-2.9.2.tar.gz
then after unpacking and moving into the folder:
./configure --prefix=/usr --disable-static --with-history && make
and
sudo make install
after this the R command install.packages("devtools") completed with success.
回答2:
From within R prompt, this command works provided that libxml2-dev has been installed:
Sys.setenv(PKG_CONFIG_PATH="/usr/lib/x86_64-linux-gnu/pkgconfig")
回答3:
For the narrower problem of installing the R package "XML", just do
sudo apt-get install r-cran-xml
Otherwise, start at the list of dependencies for "devtools" (eg from here) and install these dependencies one by one.
回答4:
Choose and Install suitable library from below as per your Linux flavor:-
- deb: libxml2-dev (Debian, Ubuntu, etc)
- rpm: libxml2-devel (Fedora, CentOS, RHEL)
- csw: libxml2_dev (Solaris)
Install with an appropriate command like apt-get, yum, etc.
回答5:
Today, 4 years and 2 months later, I was having exactly the same issue (even if in the context of the installation of a different package, xml2).
Looking closely at the .configure script of the package, I noticed that following one-line configuration test was failing:
echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>&1 || R_CONFIG_ERROR=1;
This is despite all the used parameters having correct and non-null values.
I'm not sure why exactly this test fails, but it seems to be a bug (so Dirk Eddelbuettel was right). Commenting out the test, allowed me to manually install the package without any further issues.
来源：https://stackoverflow.com/questions/31797524/r-devtools-fails-as-package-libxml-2-0-was-not-found-in-the-pkg-config-search-p