diff --git a/src/optional/R/Makefile b/src/optional/R/Makefile
index bba213db..6fbbaa32 100644
--- a/src/optional/R/Makefile
+++ b/src/optional/R/Makefile
@@ -1,4 +1,8 @@
 all:
+	# Install plyr if not installed
+	Rscript -e 'usePackage <- function(p) { if (!is.element(p, installed.packages()[,1])) { install.packages(p, dep = TRUE) }; require(p, character.only = TRUE) }; usePackage("plyr");'
+	# Install data.table if not installed
+	Rscript -e 'usePackage <- function(p) { if (!is.element(p, installed.packages()[,1])) { install.packages(p, dep = TRUE) }; require(p, character.only = TRUE) }; usePackage("data.table");'
 	cd gnuparallel && md5sum DESCRIPTION NAMESPACE R/gnuparallel.R man/gnuparallel-package.Rd > MD5
 	R CMD check --as-cran gnuparallel
 	R CMD build gnuparallel
diff --git a/src/optional/R/gnuparallel/MD5 b/src/optional/R/gnuparallel/MD5
index aa9b6d86..c89d1777 100644
--- a/src/optional/R/gnuparallel/MD5
+++ b/src/optional/R/gnuparallel/MD5
@@ -1,4 +1,4 @@
-c521738aeecfa8e237500f4a3263143e  DESCRIPTION
-d008be14407ccaa1070b98ed7d91c123  NAMESPACE
+1687988e405e42d2da3978c8456fa014  DESCRIPTION
+c9aa60a23c3248ca19b99dce2db2123b  NAMESPACE
 beb1ce7a813ec211acd651e66a397a7b  R/gnuparallel.R
 cb2aec4860699d6819f9cc18e67b8df4  man/gnuparallel-package.Rd
diff --git a/src/optional/R/gnuparallel/NAMESPACE b/src/optional/R/gnuparallel/NAMESPACE
index 32dc4bb2..229dbb91 100644
--- a/src/optional/R/gnuparallel/NAMESPACE
+++ b/src/optional/R/gnuparallel/NAMESPACE
@@ -1,6 +1,8 @@
+importFrom("utils", "read.table")
 export(gnu.parallel.filenames)
 export(gnu.parallel.load)
 export(gnu.parallel.load.lines)
 export(gnu.parallel.load.data.frame)
 export(gnu.parallel.load.data.table)
 
+