add comment about GNU make 4.0

git-svn-id: https://svn.r-project.org/R/trunk@66642 00db46b3-68df-0310-9c12-caf00c1e9a41
--verbose : also show the last arg


git-svn-id: https://svn.r-project.org/R/trunk@66644 00db46b3-68df-0310-9c12-caf00c1e9a41
add  determinant()  to the implicit generics


git-svn-id: https://svn.r-project.org/R/trunk@66645 00db46b3-68df-0310-9c12-caf00c1e9a41
Fix for PR#15981:  64 bit-only installs still got the 32 bit bin/R and bin/Rscript.
Now if a single arch is installed, the right executables get installed; if both are installed, 64 bit executables end up in bin.

git-svn-id: https://svn.r-project.org/R/trunk@66646 00db46b3-68df-0310-9c12-caf00c1e9a41