Problem while executing a Makefile

i'm installing the Rocket-Chip repository. I'm following the instructions from . The instructions are:

$ git clone
$ cd rocket-chip
$ git submodule update --init
$ export RISCV=/path/to/riscv/toolchain/installation
$ git clone
$ cd rocket-tools
$ git submodule update --init --recursive
$ export RISCV=/path/to/install/riscv/toolchain
$ export MAKEFLAGS="$MAKEFLAGS -jN" # Assuming you have N cores on your host
system
$ ./build.sh

When i launch the last command, i have these errors and warnings:

Makefile:5347: warning: rewriting of the instruction set for "check-
recursive"
Makefile:4181: warning: ignoring of the instruction old set for "check-
recursive"
ar: `u' modifier ignored since `D' is the default (see `U')
...
/usr/bin/mkdir: cannot create directory "/path": Permission denied
make[3]: *** [Makefile:4130: install-dist_ulinkDATA] Error 1
make[3]: *** Waiting for non terminated processes....
/usr/bin/mkdir: cannot create directory "/path": Permission denied
make[3]: *** [Makefile:4929: install-info-am] Error 1
make[2]: *** [Makefile:4489: install-am] Error 2
make[1]: *** [Makefile:4181: install-recursive] Error 1
make: *** [Makefile:4483: install] Error 2

I've checked all the permission of the files and the folders the makefile is interested to, but it doesn't work at all. Someone can help me please?

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