lofty@ramen:~/runelord$ nix-build default.nix
these derivations will be built:
  /nix/store/aajwvkg39vjbf3g4fajlww4gsipzk811-runelord-gateware.drv
building '/nix/store/aajwvkg39vjbf3g4fajlww4gsipzk811-runelord-gateware.drv'...
/nix/store/fiaj00zrmb7dynd2q9xmcrh5rn0mjwj0-stdenv-linux/setup: line 813: /build/env-vars: No such file or directory
unpacking sources
/nix/store/fiaj00zrmb7dynd2q9xmcrh5rn0mjwj0-stdenv-linux/setup: line 813: /build/env-vars: No such file or directory
unpacking source archive /nix/store/wss372nlr2d1blfbmzj4kv0jy4xak8ag-gateware
source root is gateware
find: '/build/..': No such file or directory
patching sources
/nix/store/fiaj00zrmb7dynd2q9xmcrh5rn0mjwj0-stdenv-linux/setup: line 813: /build/env-vars: No such file or directory
configuring
/nix/store/fiaj00zrmb7dynd2q9xmcrh5rn0mjwj0-stdenv-linux/setup: line 813: /build/env-vars: No such file or directory
no configure script, doing nothing
building
/nix/store/fiaj00zrmb7dynd2q9xmcrh5rn0mjwj0-stdenv-linux/setup: line 813: /build/env-vars: No such file or directory
Warning: No clocks found in design
Warning: No clocks found in design
2 warnings, 0 errors
Failed to load Trellis database: /nix/store/a3b1s9in3mcy91c3w8rnqy549qz5zbcr-trellis-2019.10.13/bin/../../../../share/trellis/database/devices.json: cannot open file
Traceback (most recent call last):
  File "runelord.py", line 24, in <module>
    VersaECP5Platform().build(PeekPokeVersa(), do_program=False)
  File "/nix/store/zfnc5vh933rjljy6bhpdk9dmrfmac5h4-python3.7-nmigen-unstable-2019-10-17/lib/python3.7/site-packages/nmigen/build/plat.py", line 77, in build
    products = plan.execute_local(build_dir)
  File "/nix/store/zfnc5vh933rjljy6bhpdk9dmrfmac5h4-python3.7-nmigen-unstable-2019-10-17/lib/python3.7/site-packages/nmigen/build/run.py", line 98, in execute_local
    subprocess.check_call(["sh", "{}.sh".format(self.script)])
  File "/nix/store/gpnm7i19lpj8p43mjrdw03d0hjalmskl-python3-3.7.5/lib/python3.7/subprocess.py", line 363, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['sh', 'build_top.sh']' returned non-zero exit status 1.
builder for '/nix/store/aajwvkg39vjbf3g4fajlww4gsipzk811-runelord-gateware.drv' failed with exit code 1
error: build of '/nix/store/aajwvkg39vjbf3g4fajlww4gsipzk811-runelord-gateware.drv' failed