The patch I need to apply is for RISC-V makefile; in crosstool-ng there
seem to be no Makefile for RISC-V. I think in crosstool-ng one can
configure RISC-V options using 'ct-ng menuconfig' once you configured then
one need to use ct-ng build to to build compiler. The crosstool-ng will
build compiler using the config options, I think there is no Makefile as
such for RISC-V. However, I might be wrong.