Build for FreeBSD using Cirrus CI.

.cirrus.yml

@@ -0,0 +1,16 @@
+env:
+  CIRRUS_CLONE_DEPTH: 1
+  ARCH: amd64
+  BASICS: yes
+
+task:
+  freebsd_instance:
+    image: freebsd-12-0-release-amd64
+  env:
+    matrix:
+      - EMULATOR: simh
+      # EMULATOR: klh10
+      - EMULATOR: pdp10-ka
+      # EMULATOR: pdp10-kl
+  install_script: sh -ex build/dependencies.sh install_freebsd
+  script: gmake all EMULATOR=$EMULATOR

build/dependencies.sh

@@ -18,6 +18,15 @@ install_linux() {
     esac
 }
 
+install_freebsd() {
+    pkg upgrade -y
+    pkg install -y gmake git expect
+    case "$EMULATOR" in
+        pdp10-ka) pkg install -y sdl2 sdl2_image pkgconf;;
+        pdp10-kl) pkg install -y autoconf;;
+    esac
+}
+
 install_osx() {
     true
 }