@@ -11,7 +11,7 @@

 if [[ "${CI}" == "true" ]]; then

     if [[ "${TRAVIS}" == "true" ]]; then 

-        echo "** Overriding DESCRIPTION and removing C++14 on Travis only"

-        sed -i '/SystemRequirements: C++14/d' DESCRIPTION

+        echo "** Overriding src/Makevars and removing C++14 on Travis only"

+        sed -i '/CXX_STD = CXX14/d' src/Makevars

     fi

 fi

\ No newline at end of file

@@ -12,6 +12,6 @@

 if [[ "${CI}" == "true" ]]; then

     if [[ "${TRAVIS}" == "true" ]]; then 

         echo "** Overriding DESCRIPTION and removing C++14 on Travis only"

-        sed -i 's|SystemRequirements: C++14\n||' DESCRIPTION

+        sed -i '/SystemRequirements: C++14/d' DESCRIPTION

     fi

 fi

\ No newline at end of file

@@ -12,6 +12,6 @@

 if [[ "${CI}" == "true" ]]; then

     if [[ "${TRAVIS}" == "true" ]]; then 

         echo "** Overriding DESCRIPTION and removing C++14 on Travis only"

-        sed -i 's|SystemRequirements: C++14||' DESCRIPTION

+        sed -i 's|SystemRequirements: C++14\n||' DESCRIPTION

     fi

 fi

\ No newline at end of file

@@ -12,6 +12,6 @@

 if [[ "${CI}" == "true" ]]; then

     if [[ "${TRAVIS}" == "true" ]]; then 

         echo "** Overriding DESCRIPTION and removing C++14 on Travis only"

-        sed -i 's|C++14, ||' DESCRIPTION

+        sed -i 's|SystemRequirements: C++14||' DESCRIPTION

     fi

 fi

\ No newline at end of file

new file mode 100644

@@ -0,0 +1,17 @@

+#!/bin/bash

+

+## Travis can let us run R 3.4.0 (from CRAN and the PPAs) but this R version

+## does not know about C++14.  Even though we can select CXX_STD = C++14, R

+## will fail as the version we use there was built in too old an environment,

+## namely Ubuntu "trusty" 14.04.

+##

+## So we install g++-6 from another repo and rely on the fact that is

+## defaults to C++14.  Sadly, we need R to not fail and hence, just on

+## Travis, remove the C++14 instruction

+

+if [[ "${CI}" == "true" ]]; then

+    if [[ "${TRAVIS}" == "true" ]]; then 

+        echo "** Overriding DESCRIPTION and removing C++14 on Travis only"

+        sed -i 's|C++14, ||' DESCRIPTION

+    fi

+fi

\ No newline at end of file