diff --git a/LOG b/LOG
index 93419364dc..e43e0d425a 100644
--- a/LOG
+++ b/LOG
@@ -960,5 +960,10 @@
     schlib.c
 - Updated csug socket code to match that in examples folder
     csug/foreign.stex, examples/socket.ss
+- add an option --disable-x11
+    c/version.h, configure
+- allow s_ee_get_clipboard to use the pastebuffer on macOS even when X11 is not
+  available.
+    expeditor.c
 - Adjust cp0 to not replace a procedure name from a let wrapper
     cp0.ss, misc.ms
diff --git a/c/expeditor.c b/c/expeditor.c
index 84c38971ca..78f6be3bfb 100644
--- a/c/expeditor.c
+++ b/c/expeditor.c
@@ -888,8 +888,10 @@ static void s_ee_line_feed(void) {
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 #include <sys/select.h>
+#endif /* LIBX11 */
 
 static ptr s_ee_get_clipboard(void) {
+#ifdef LIBX11
   static enum {UNINITIALIZED, INITIALIZED, FAILED} status = UNINITIALIZED;
   static int (*pXConvertSelection)(Display *, Atom, Atom, Atom, Window, Time);
   static int (*pXPending)(Display *display);
@@ -899,9 +901,11 @@ static ptr s_ee_get_clipboard(void) {
 
   static Display *D;
   static Window R, W;
+#endif /* LIBX11 */
 
   ptr p = S_G.null_string;
 
+#ifdef LIBX11
   if (status == UNINITIALIZED) {
     char *display_name;
     void *handle;
@@ -986,6 +990,7 @@ static ptr s_ee_get_clipboard(void) {
       }
     }
   }
+#endif /* LIBX11 */
 
 #ifdef MACOSX
 #define PBPASTEBUFSIZE 1024
@@ -1013,11 +1018,6 @@ static ptr s_ee_get_clipboard(void) {
 
   return p;
 }
-#else /* LIBX11 */
-static ptr s_ee_get_clipboard(void) {
-  return S_G.null_string;
-}
-#endif
 
 static void s_ee_write_char(wchar_t wch) {
   locale_t old; char buf[MB_LEN_MAX]; size_t n;
diff --git a/c/version.h b/c/version.h
index ad9ac5c4c7..ebb4937a07 100644
--- a/c/version.h
+++ b/c/version.h
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include "config.h"
+
 #if (machine_type == machine_type_arm32le || machine_type == machine_type_tarm32le || machine_type == machine_type_arm64le || machine_type == machine_type_tarm64le)
 #if (machine_type == machine_type_tarm32le || machine_type == machine_type_tarm64le)
 #define PTHREADS
@@ -34,7 +36,9 @@ typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
 #define FLUSHCACHE
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define LSEEK lseek64
 #define OFF_T off64_t
 #define _LARGEFILE64_SOURCE
@@ -67,7 +71,9 @@ typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
 #define FLUSHCACHE
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define LSEEK lseek64
 #define OFF_T off64_t
 #define _LARGEFILE64_SOURCE
@@ -100,7 +106,9 @@ typedef char *memcpy_t;
 typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define LSEEK lseek64
 #define OFF_T off64_t
 #define _LARGEFILE64_SOURCE
@@ -133,7 +141,9 @@ typedef char *memcpy_t;
 typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define SECATIME(sb) (sb).st_atimespec.tv_sec
 #define SECCTIME(sb) (sb).st_ctimespec.tv_sec
 #define SECMTIME(sb) (sb).st_mtimespec.tv_sec
@@ -164,7 +174,9 @@ typedef char *memcpy_t;
 typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define SECATIME(sb) (sb).st_atimespec.tv_sec
 #define SECCTIME(sb) (sb).st_ctimespec.tv_sec
 #define SECMTIME(sb) (sb).st_mtimespec.tv_sec
@@ -248,7 +260,9 @@ typedef char *memcpy_t;
 typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define SECATIME(sb) (sb).st_atimespec.tv_sec
 #define SECCTIME(sb) (sb).st_ctimespec.tv_sec
 #define SECMTIME(sb) (sb).st_mtimespec.tv_sec
@@ -279,7 +293,9 @@ typedef char *memcpy_t;
 typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
+#ifndef DISABLE_X11
 #define LIBX11 "/usr/X11R6/lib/libX11.dylib"
+#endif
 #define _DARWIN_USE_64_BIT_INODE
 #define SECATIME(sb) (sb).st_atimespec.tv_sec
 #define SECCTIME(sb) (sb).st_ctimespec.tv_sec
@@ -346,7 +362,9 @@ typedef char *memcpy_t;
 typedef char tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
+#ifndef DISABLE_X11
 #define LIBX11 "libX11.so"
+#endif
 #define SECATIME(sb) (sb).st_atim.tv_sec
 #define SECCTIME(sb) (sb).st_ctim.tv_sec
 #define SECMTIME(sb) (sb).st_mtim.tv_sec
diff --git a/configure b/configure
index e98b581269..ca9c3398b6 100755
--- a/configure
+++ b/configure
@@ -37,6 +37,7 @@ installman=""
 installschemename="scheme"
 installpetitename="petite"
 installscriptname="scheme-script"
+disablex11=no
 : ${CC:="gcc"}
 : ${CPPFLAGS:=""}
 : ${CFLAGS:=""}
@@ -200,6 +201,9 @@ while [ $# != 0 ] ; do
     --help)
       help=yes
       ;;
+    --disable-x11)
+      disablex11=yes
+      ;;
     CC=*)
       CC=`echo $1 | sed -e 's/^CC=//'`
       ;;
@@ -266,6 +270,7 @@ if [ "$help" = "yes" ]; then
   echo "  -m=<machine type>                 same as --machine <machine type> ($m)"
   echo "  --threads                         specify threaded version ($threads)"
   echo "  --32|--64                         specify 32/64-bit version ($bits)"
+  echo "  --disable-x11                     disabling x11"
   echo "  --installprefix=<pathname>        final installation root ($installprefix)"
   echo "  --installbin=<pathname>           bin directory ($installbin)"
   echo "  --installlib=<pathname>           lib directory ($installlib)"
@@ -368,6 +373,10 @@ cat > $w/c/config.h << END
 #endif
 END
 
+if [ "$disablex11" = "yes" ]; then
+  echo '#define DISABLE_X11' >> $w/c/config.h
+fi
+
 cat > $w/c/Mf-config << END
 CC=$CC
 CPPFLAGS=$CPPFLAGS