Add support for FreeBSD build

.github/workflows/build.yml

@@ -279,6 +279,51 @@ jobs:
         cat unicon-config.log
         cat unicon-features.log
 
+  FreeBSD:
+   runs-on: ubuntu-latest
+   name: FreeBSD
+
+   steps:
+   - uses: actions/checkout@v4
+   - name: Start FreeBSD VM
+     id: vm
+     uses: vmactions/freebsd-vm@v1
+     with:
+      usesh: true # default shell is csh, switch to sh
+      prepare: |
+        pkg install -y -f autoconf gmake lang/gcc git
+
+   - name: Configure
+     shell: freebsd {0}
+     run: |
+      cd $GITHUB_WORKSPACE
+      git config --global --add safe.directory $GITHUB_WORKSPACE
+      ./configure
+
+   - name: Make
+     shell: freebsd {0}
+     run: cd $GITHUB_WORKSPACE && gmake
+
+   - name: HtmlDoc
+     shell: freebsd {0}
+     run: cd $GITHUB_WORKSPACE && gmake htmldoc
+
+   - name: Test
+     shell: freebsd {0}
+     run: cd $GITHUB_WORKSPACE && gmake Test
+
+   - name: TestReport
+     shell: freebsd {0}
+     run: cd $GITHUB_WORKSPACE && gmake -C tests Report
+
+   - name: Summary
+     shell: freebsd {0}
+     run: |
+      cd $GITHUB_WORKSPACE
+      cat unicon-config.log
+      cat unicon-features.log
+
+
   DebianPkg:
     runs-on: ${{ matrix.cfg.os }}
     name: ${{ matrix.cfg.name }}

README.md

@@ -97,7 +97,7 @@ dnf install libjpeg-turbo-devel libpng-devel libX11-devel mesa-libGL-devel mesa-
 Go into the Unicon directory and run:
 ```
 ./configure
-make
+make -j
 ```
 After that you can add `unicon/bin` to the $PATH environment variable or install Unicon instead:
 ```
@@ -115,6 +115,19 @@ explicitly set the compiler as follows:
 If you want access to the graphics facilities of Unicon, you also need to download
 and install the XQuartz package from https://www.xquartz.org/.
 
+### *BSD
+
+installl build dependencies. Make sure to use GNU `gmake` when building.
+```
+pkg install -y -f autoconf gmake lang/gcc git
+```
+
+Configure, make, and optionally install unicon:
+```
+./configure
+gmake -j
+gmake install
+```
 
 ### Windows
 There are two possibilities depending on the choice of the C runtime library.  You can choose