I used the hash mentioned in the Nix flake, which is a little newer.
Replace with the hash of the actual tagged release.
### Build nextpnr-xilinx from release 0.7.0 of openXC7
cd nextpnr-xilinx
### Build nextpnr-xilinx from release 0.7.0 of openXC7
cd nextpnr-xilinx
-git checkout 1c57f511f80945a709d1d43478d39ad0b6cd51d2
+git checkout 14c62813ba93258143c2551f4beb0b7e044c5912
git submodule init
git submodule update
cmake -DARCH=xilinx -DBUILD_GUI=OFF \
git submodule init
git submodule update
cmake -DARCH=xilinx -DBUILD_GUI=OFF \