title: Issue Downloading gribr package
body: <p>I have been trying to download the R package gribr to work with grib data files in R but I have been getting some trouble with the download. Any assistance or direction on how to achieve this will be highly appreciated.</p>
  <pre><code>remotes::install_github(&quot;nawendt/gribr&quot;)
  </code></pre>
  <pre><code>&gt; Downloading GitHub repo nawendt/gribr@HEAD
  √  checking for file 'C:\Users\AppData\Local\Temp\RtmpsDzyVa\remotes81ac6bc768ec\nawendt-gribr-c1ea732/DESCRIPTION' (2.2s)
  -  preparing 'gribr':
  √  checking DESCRIPTION meta-information ... 
  -  cleaning src
  -  running 'cleanup.win'
  -  checking for LF line-endings in source and make files and shell scripts (336ms)
  -  checking for empty or unneeded directories
  -  building 'gribr_1.2.3.tar.gz'
     Warning: file 'gribr/cleanup' did not have execute permissions: corrected
     Warning: file 'gribr/configure' did not have execute permissions: corrected
     
  * installing *source* package 'gribr' ...
  ** using staged installation
  ** libs
  Warning: this package has a non-empty 'configure.win' file,
  so building only the main architecture
  
  &quot;C:/rtools40/mingw64/bin/&quot;gcc  -I&quot;C:/Users/DOCUME~1/R/R-40~1.3/include&quot; -DNDEBUG          -O2 -Wall  -std=gnu99 -mfpmath=sse -msse2 -mstackrealign -c grib_api_version.c -o grib_api_version.o
  In file included from grib_api_version.c:4:
  gribr.h:1:10: fatal error: eccodes.h: No such file or directory
   #include &lt;eccodes.h&gt;
            ^~~~~~~~~~~
  compilation terminated.
  make: *** [C:/Users/DOCUME~1/R/R-40~1.3/etc/x64/Makeconf:222: grib_api_version.o] Error 1
  ERROR: compilation failed for package 'gribr'
  * removing 'C:/Users/Documents/R/R-4.0.3/library/gribr
  </code></pre>