diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..7b9f6c0
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,21 @@
+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 libglx-dev libgl-dev libxmu-dev libglu1-mesa-dev libxi-dev
+    - name: build
+      run: cd sera1 && ./fullbuild
+    - name: make_all
+      run: cd sera1 && make all
diff --git a/sera1/Imakefile b/sera1/Imakefile
index 9d3f848..033c257 100644
--- a/sera1/Imakefile
+++ b/sera1/Imakefile
@@ -9,5 +9,5 @@ Shared Sera3d SeraCalc SeraDose SeraImage \
 SeraMC SeraMenu SeraModel SeraPlan SeraPlot \
 Util
 
-MakeSubdirs($(SUBDIRS))
+MakeSubdirsOrExit($(SUBDIRS))
 DependSubdirs($(SUBDIRS))
diff --git a/sera1/config/Imake.rules b/sera1/config/Imake.rules
index d982745..4295433 100644
--- a/sera1/config/Imake.rules
+++ b/sera1/config/Imake.rules
@@ -1836,6 +1836,21 @@ name::									@@\
 	done
 #endif
 
+/*
+ * MakeSubdirsOrExit - recursively make a series of steps and exit if one
+ * fails.
+ */
+#ifndef MakeSubdirsOrExit
+#define MakeSubdirsOrExit(dirs)						@@\
+all::									@@\
+	@MakeFlagsToShellFlags(ik,set +e); \				@@\
+	for i in dirs ;\						@@\
+	do \								@@\
+		echo "making all in $(CURRENT_DIR)/$$i..."; \		@@\
+		(cd $$i &&  $(MAKE) $(MFLAGS) PassCDebugFlags all) || exit -1; \	@@\
+	done
+#endif
+
 
 /*
  * NamedMakeSubdirs - generate rules to do makes in the given subdirectories.
diff --git a/sera1/config/linux.cf b/sera1/config/linux.cf
index 58d52e0..f83836c 100644
--- a/sera1/config/linux.cf
+++ b/sera1/config/linux.cf
@@ -417,7 +417,7 @@ EXTRA_X_LIBS        = -lXmu -lXt -lSM -lICE -lXext -lXintl -lXi -lX11
 #else
 #define StandardIncludes  -I/usr/X11R6/include -I$(TOP)/Shared/include
 #define ExtraLibraries    -L/usr/X11R6/lib -L$(TOP)/Shared/lib
-EXTRA_X_LIBS        = -lXmu -lXt -lSM -lICE -lXext -lXp -lXi -lX11
+EXTRA_X_LIBS        = -lXmu -lXt -lSM -lICE -lXext -lXi -lX11
 #endif
 
 XCOMM Location for libraries built withing the project.
diff --git a/sera1/fullbuild b/sera1/fullbuild
index 49f564f..42a1845 100755
--- a/sera1/fullbuild
+++ b/sera1/fullbuild
@@ -1,5 +1,8 @@
 #!/bin/sh
-
+SERA_HOME=`dirname $0`
+cd $SERA_HOME
+export SERA_HOME=`pwd`
+echo SERA_HOME=$SERA_HOME
 touch $SERA_HOME/config/Local.def
 imake -I./config
 make Makefile