diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 78055c8..3637a78 100755
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,3 +18,14 @@ jobs:
       run: grep 'sudo apt install' INSTALL | sed 's/\$//' | sh
     - name: Compile
       run: make -C GUI/xephem
+
+  compile-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install OpenSSL
+      run: brew install openssl
+    - name: Install XQuartz
+      run: brew install xquartz --cask
+    - name: Compile
+      run: make -C GUI/xephem MOTIF=../../libXm/osx
diff --git a/GUI/xephem/Makefile b/GUI/xephem/Makefile
index ddfbef9..1f20e1b 100644
--- a/GUI/xephem/Makefile
+++ b/GUI/xephem/Makefile
@@ -28,13 +28,25 @@ ifndef MOTIFL
 MOTIFL = /usr/lib
 endif
 
-# for linux and Apple OS X
+# For Linux and Apple OS X
+
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Linux)
+  PLATI :=
+  PLATL :=
+endif
+ifeq ($(UNAME_S),Darwin)
+  PLATI := -I/opt/X11/include -I/usr/local/opt/openssl@3/include
+  PLATL := -L/opt/X11/lib -L/usr/local/opt/openssl@3/lib
+  LASTLIB := xprint_fake.o
+endif
+
 CC = gcc
 CLDFLAGS = -g
-CFLAGS = $(LIBINC) $(CLDFLAGS) -O2 -Wall -I$(MOTIFI) -I/opt/X11/include
-LDFLAGS = $(LIBLNK) $(CLDFLAGS) -L$(MOTIFL) -L/opt/X11/lib
+CFLAGS = $(LIBINC) $(CLDFLAGS) -O2 -Wall -I$(MOTIFI) $(PLATI)
+LDFLAGS = $(LIBLNK) $(CLDFLAGS) -L$(MOTIFL) $(PLATL)
 XLIBS = -lXm -lXt -lXext -lXmu -lX11
-LIBS = $(XLIBS) $(LIBLIB) -lm -lssl
+LIBS = $(XLIBS) $(LIBLIB) -lm -lssl $(LASTLIB)
 
 # static linking on Apple using X11 libs from ports
 # CC = gcc
@@ -183,7 +195,8 @@ OBJS =			\
 	xe2.o		\
 	xe3.o		\
 	xephem.o	\
-	xmisc.o
+	xmisc.o		\
+	xprint_fake.o
 
 all: libs xephem xephem.1
 
diff --git a/GUI/xephem/xprint_fake.c b/GUI/xephem/xprint_fake.c
new file mode 100644
index 0000000..35a2cf0
--- /dev/null
+++ b/GUI/xephem/xprint_fake.c
@@ -0,0 +1 @@
+void *_XpEndJob = 0;
diff --git a/libXm/osx/Xm/Xm.h b/libXm/osx/Xm/Xm.h
index 07ec60d..2d52202 100644
--- a/libXm/osx/Xm/Xm.h
+++ b/libXm/osx/Xm/Xm.h
@@ -65,7 +65,7 @@
 #include <X11/Intrinsic.h>
 #include <X11/Shell.h>
 #include <X11/Xatom.h>
-#include <X11/extensions/Print.h>
+/* #include <X11/extensions/Print.h> */
 #include <Xm/XmStrDefs.h>
 #include <Xm/XmStrDefs22.h>
 #include <Xm/XmStrDefs23.h>
@@ -847,7 +847,7 @@ typedef struct
 {
     int		reason;	   /* XmCR_START_JOB, XmCR_END_JOB, XmCR_PAGE_SETUP */
     XEvent	*event;
-    XPContext	context;
+    /* XPContext	context; */
     Boolean	last_page; /* in_out */
     XtPointer	detail;
 } XmPrintShellCallbackStruct;