diff --git a/.cirrus.yml b/.cirrus.yml
index a493b04f..5221be46 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -5,7 +5,7 @@ task:
     memory: 20
     dockerfile: .cirrus/Dockerfile.ubuntu16.04
 
-  build_script: mkdir build && cd build && cmake .. -DARCH=all -DBUILD_TESTS=on && make -j $(nproc)
+  build_script: mkdir build && cd build && cmake .. -DARCH=all -DOXIDE_INSTALL_PREFIX=$HOME/.cargo -DBUILD_TESTS=on && make -j3
   submodule_script: git submodule sync --recursive && git submodule update --init --recursive
   test_generic_script: cd build && ./nextpnr-generic-test
   test_ice40_script: cd build && ./nextpnr-ice40-test
diff --git a/.cirrus/Dockerfile.ubuntu16.04 b/.cirrus/Dockerfile.ubuntu16.04
index 92ab2bae..e8de4ed9 100644
--- a/.cirrus/Dockerfile.ubuntu16.04
+++ b/.cirrus/Dockerfile.ubuntu16.04
@@ -9,7 +9,7 @@ RUN set -e -x ;\
         build-essential autoconf cmake clang bison wget flex gperf \
         libreadline-dev gawk tcl-dev libffi-dev graphviz xdot python3-dev \
         libboost-all-dev qt5-default git libftdi-dev pkg-config libeigen3-dev \
-        zlib1g-dev
+        zlib1g-dev curl
 
 RUN set -e -x ;\
     mkdir -p /usr/local/src ;\
@@ -52,3 +52,13 @@ RUN set -e -x ;\
     cmake . ;\
     make -j $(nproc) ;\
     make install
+
+RUN set -e -x ;\
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y ;\
+    mkdir -p /usr/local/src ;\
+    cd /usr/local/src ;\
+    git clone --recursive https://github.com/daveshah1/prjoxide.git ;\
+    cd prjoxide ;\
+    git reset --hard bd5122fab12c1a517588365bd95cbfaa47eff25c ;\
+    cd libprjoxide ;\
+    PATH=$PATH:$HOME/.cargo/bin cargo install --path prjoxide
diff --git a/.cirrus/archcheck.sh b/.cirrus/archcheck.sh
index fde19216..35f115d0 100755
--- a/.cirrus/archcheck.sh
+++ b/.cirrus/archcheck.sh
@@ -4,3 +4,4 @@ echo "Running archcheck!"
 ${BUILD_DIR}/nextpnr-ice40 --hx8k --package ct256 --test
 ${BUILD_DIR}/nextpnr-ice40 --up5k --package sg48 --test
 ${BUILD_DIR}/nextpnr-ecp5 --um5g-25k --package CABGA381 --test
+${BUILD_DIR}/nextpnr-nexus --device LIFCL-40-9BG400CES --test