gnu: cran.scm: Add missing module.

This is a follow-up to 9ebfdcd36c75cfa96cd5ff4fad10ec17e4103c6d.

* gnu/packages/cran.scm: Import pkg-config.

diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index ec1f2e1..9dc075f 100644 (file)
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -35,6 +35,7 @@
   #:use-module (gnu packages maths)
   #:use-module (gnu packages mpi)
   #:use-module (gnu packages perl)
+  #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages statistics)
   #:use-module (gnu packages web))