title: Can't load the library tidyverse, even though I have installed it
body: <p>I run at first:</p>
  
  <p>install.packages("tidyverse")</p>
  
  <p>After it is done running, in the end, it says:</p>
  
  <pre><code>Warning in install.packages :
    installation of package ‘tidyverse’ had non-zero exit status
  The downloaded source packages are in
      ‘/tmp/RtmpWG5QjC/downloaded_packages’
  </code></pre>
  
  <p>But when I try to run:</p>
  
  <pre><code>library(tidyverse)
  </code></pre>
  
  <p>I get this reply:</p>
  
  <pre><code>Error in library(tidyverse) : there is no package called ‘tidyverse’
  </code></pre>
  
  <p>I then do this process on the ubuntu console in R but I again get the same result</p>
  
  <p>The whole output while downloading:</p>
  
  <pre><code>Installing package into ‘/home/anastasis/R/x86_64-pc-linux-gnu-library/3.4’
  (as ‘lib’ is unspecified)
  also installing the dependencies ‘curl’, ‘httr’, ‘rvest’, ‘xml2’
  
  trying URL 'https://cloud.r-project.org/src/contrib/curl_4.0.tar.gz'
  Content type 'application/x-gzip' length 379180 bytes (370 KB)
  ==================================================
  downloaded 370 KB
  
  trying URL 'https://cloud.r- 
  project.org/src/contrib/httr_1.4.1.tar.gz'
  Content type 'application/x-gzip' length 158465 bytes (154 KB)
  ==================================================
  downloaded 154 KB
  
  trying URL 'https://cloud.r- 
  project.org/src/contrib/rvest_0.3.4.tar.gz'
  Content type 'application/x-gzip' length 1631028 bytes (1.6 MB)
  ==================================================
  downloaded 1.6 MB
  
  trying URL 'https://cloud.r- 
  project.org/src/contrib/xml2_1.2.2.tar.gz'
  Content type 'application/x-gzip' length 261081 bytes (254 KB)
  ==================================================
  downloaded 254 KB
  
  trying URL 'https://cloud.r- 
  project.org/src/contrib/tidyverse_1.2.1.tar.gz'
  Content type 'application/x-gzip' length 61647 bytes (60 KB)
  ==================================================
  downloaded 60 KB
  
  * installing *source* package ‘curl’ ...
  ** package ‘curl’ successfully unpacked and MD5 sums checked
  Package libcurl was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libcurl.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libcurl' found
  Package libcurl was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libcurl.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libcurl' found
  Using PKG_CFLAGS=
  Using PKG_LIBS=-lcurl
  ------------------------- ANTICONF ERROR ---------------------------
  Configuration failed because libcurl was not found. Try installing:
   * deb: libcurl4-openssl-dev (Debian, Ubuntu, etc)
   * rpm: libcurl-devel (Fedora, CentOS, RHEL)
   * csw: libcurl_dev (Solaris)
  If libcurl is already installed, check that 'pkg-config' is in your
  PATH and PKG_CONFIG_PATH contains a libcurl.pc file. If pkg-config
  is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:
  R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
  --------------------------------------------------------------------
  ERROR: configuration failed for package ‘curl’
  * removing ‘/home/anastasis/R/x86_64-pc-linux-gnu-library/3.4/curl’
  Warning in install.packages :
    installation of package ‘curl’ had non-zero exit status
  * installing *source* package ‘xml2’ ...
  ** package ‘xml2’ successfully unpacked and MD5 sums checked
  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
  No package 'libxml-2.0' found
  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
  No package 'libxml-2.0' found
  Using PKG_CFLAGS=
  Using PKG_LIBS=-lxml2
  ------------------------- ANTICONF ERROR ---------------------------
  Configuration failed because libxml-2.0 was not found. Try installing:
   * deb: libxml2-dev (Debian, Ubuntu, etc)
   * rpm: libxml2-devel (Fedora, CentOS, RHEL)
   * csw: libxml2_dev (Solaris)
  If libxml-2.0 is already installed, check that 'pkg-config' is in your
  PATH and PKG_CONFIG_PATH contains a libxml-2.0.pc file. If pkg-config
  is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:
  R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
  --------------------------------------------------------------------
  ERROR: configuration failed for package ‘xml2’
  * removing ‘/home/anastasis/R/x86_64-pc-linux-gnu-library/3.4/xml2’
  Warning in install.packages :
    installation of package ‘xml2’ had non-zero exit status
  ERROR: dependency ‘curl’ is not available for package ‘httr’
  * removing ‘/home/anastasis/R/x86_64-pc-linux-gnu-library/3.4/httr’
  Warning in install.packages :
    installation of package ‘httr’ had non-zero exit status
  ERROR: dependencies ‘xml2’, ‘httr’ are not available for package ‘rvest’
  * removing ‘/home/anastasis/R/x86_64-pc-linux-gnu-library/3.4/rvest’
  Warning in install.packages :
    installation of package ‘rvest’ had non-zero exit status
  ERROR: dependencies ‘httr’, ‘rvest’, ‘xml2’ are not available for 
  package ‘tidyverse’
  * removing ‘/home/anastasis/R/x86_64-pc-linux-gnu- 
  library/3.4/tidyverse’
  Warning in install.packages :
    installation of package ‘tidyverse’ had non-zero exit status
  
  The downloaded source packages are in
          ‘/tmp/RtmpWG5QjC/downloaded_packages’
  </code></pre>
  
  <p>I have the installed the dependency xml2 but when I redo the process with tidyverse I get the same result</p>