Error: "there is no package called 'rsvg'" on Solaris

[twang2218]

Today, I received an email from CRAN team about my package pmap which depends on DiagrammeR package, the mail said:

See https://cran.r-project.org/web/checks/check_results_pmap.html (which is still updating).

You are not using the Suggests package rsvg conditionally as required in §1.1.3.1 of the manual. Please check all other uses of suggested packages, and correct before Mar 22 to safely retain the package on CRAN.

And the logs of the failed part of my package is following:

Version: 0.6.0 
Check: package dependencies 
Result: NOTE 
    Package suggested but not available for checking: ‘rsvg’ 
Flavor: r-patched-solaris-x86

Version: 0.6.0 
Check: tests 
Result: ERROR 
     Running ‘testthat.R’ [28s/30s]
    Running the tests in ‘tests/testthat.R’ failed.
    Complete output:
     > library(testthat)
     > library(pmap)
     > 
     > set.seed(101)
     > 
     > test_check("pmap")
     ── 1. Error: render_pmap_file() should be able to render to a file (@test_render
     there is no package called 'rsvg'
     1: render_pmap_file(p, file_name, format = format) at testthat/test_render_pmap_file.R:15
     2: DiagrammeR::export_graph(p, file_name = file_name, file_type = format, width = width, 
     height = height)
     3: rsvg::rsvg_pdf
     4: getExportedValue(pkg, name)
     5: asNamespace(ns)
     6: getNamespace(ns)
     7: tryCatch(loadNamespace(name), error = function(e) stop(e))
     8: tryCatchList(expr, classes, parentenv, handlers)
     9: tryCatchOne(expr, names, parentenv, handlers[[1L]])
     10: value[[3L]](cond)

It seems caused by the DiagrammeR::export_graph() calling the suggested package rsvg without using the conditional pattern recommended at CRAN manual 1.1.3.1.

   if (requireNamespace("rgl", quietly = TRUE)) {
      rgl::plot3d(...)
   } else {
      ## do something else not involving rgl.
   }

[thirupathi-chintu]

Binary packages for OS-X or Windows can be installed directly from CRAN:
install.packages("rsvg")

Installation from source on Linux or OSX requires librsvg2. On Debian or Ubuntu install librsvg2-dev:
sudo apt-get install -y librsvg2-dev

On Fedora, CentOS or RHEL we need librsvg2-devel:
sudo yum install librsvg2-devel

On OS-X use rsvg from Homebrew:
brew install librsvg