Unrecognised option "-lOpenCL"

install.packages("gpuR") returns "-lOpenCL is not found" for ld.  I searched "-lOpenCL" in gpuR_2.0.6.tar.gz and found a line,
PKG_LIBS = -L../inst/include/loader/x64 -lOpenCL
in "Makevars.win".
Isn't it a typo?