Build with Circle CI.

- Needs the same sudo stub as GitLab.
- Some X11 libraries are required for building with the KA10 simulator.

.circleci/config.yml

@@ -0,0 +1,17 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: debian
+    environment:
+      EMULATOR: "sims"
+    steps:
+      - checkout
+      - run: sh -ex build/dependencies.sh install_linux
+      - run:
+          name: build
+          command: "make EMULATOR=$EMULATOR"
+          no_output_timeout: 60m
+          timeout: 60m
+      - store_artifacts:
+          path: out

build/dependencies.sh

@@ -1,4 +1,4 @@
-if test -n "$GITLAB_CI"; then
+if test -n "$GITLAB_CI" -o -n "$CIRCLECI"; then
     sudo() {
         "$@"
     }
@@ -9,9 +9,10 @@ install_linux() {
     sudo apt-get install -my expect
     # For GitLab CI
     sudo apt-get install -my git make gcc libncurses-dev autoconf
-    if test "$EMULATOR" = simh; then
-	sudo apt-get install -y simh
-    fi
+    case "$EMULATOR" in
+        simh) sudo apt-get install -y simh;;
+        sims) sudo apt-get install -y libx11-dev libxt-dev;;
+    esac
 }
 
 "$1"