diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..ec332c3
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,19 @@
+name: build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: install
+      run: sudo apt-get install libmotif-dev libxpm-dev gfortran xutils-dev
+    - name: build
+      run: cd sera1 && ./fullbuild
diff --git a/sera1/fullbuild b/sera1/fullbuild
index 49f564f..ee71197 100755
--- a/sera1/fullbuild
+++ b/sera1/fullbuild
@@ -1,5 +1,8 @@
 #!/bin/sh
-
+SERA_HOME=`dirname $0`
+cd $SERA_HOME
+export SERA_HOME=`pwd`
+echo $SERA_HOME
 touch $SERA_HOME/config/Local.def
 imake -I./config
 make Makefile