import/cran: Add more strings to the list of invalid packages.

* guix/import/cran.scm (invalid-packages): Add "c++", "c++17", and
"posix.1-2001" to list of invalid packages.

diff --git a/guix/import/cran.scm b/guix/import/cran.scm
index 17e33d5..0b80b5f 100644 (file)
--- a/guix/import/cran.scm
+++ b/guix/import/cran.scm
@@ -390,9 +390,12 @@ empty list when the FIELD cannot be found."
 ;; The field for system dependencies is often abused to specify non-package
 ;; dependencies (such as c++11).  This list is used to ignore them.
 (define invalid-packages
-  (list "c++11"
+  (list "c++"
+        "c++11"
         "c++14"
+        "c++17"
         "getopt::long"
+        "posix.1-2001"
         "linux"
         "none"
         "windows"