--- a/tcltk/BUILD_DIR/configure	2021-07-13 14:18:46.000000000 -0500
+++ b/tcltk/BUILD_DIR/configure	2022-02-15 13:32:41.678576015 -0600
@@ -6080,36 +6080,6 @@
       x_includes="/usr/local/include"
     fi
   fi
-  # AC_PATH_X checks for Xlib.h, but somehow a missing X11/Xlib.h can
-  # still get past it and cause problems later in the build (tk.h), so
-  # try an additional test here just to make sure that it's installed:
-  if test "x$x_includes" = "x"; then
-    as_fn_error $? "No X11 include directory found. Please specify location using --x-includes option." "$LINENO" 5
-  else
-    xlib_h="$x_includes/X11/Xlib.h"
-    xintrinsic_h="$x_includes/X11/Intrinsic.h"
-    xstringdefs_h="$x_includes/X11/StringDefs.h"
-    if test -f $xlib_h; then
-      if test -f $xintrinsic_h; then
-        if test -f $xstringdefs_h; then
-          XINCLUDES="-I$x_includes"
-          { $as_echo "$as_me:${as_lineno-$LINENO}: result: Found $xlib_h" >&5
-$as_echo "Found $xlib_h" >&6; }
-          { $as_echo "$as_me:${as_lineno-$LINENO}: result: Using $x_includes for X11 header files" >&5
-$as_echo "Using $x_includes for X11 header files" >&6; }
-        else
-          as_fn_error $? "Required header X11/StringDefs.h not found in $x_includes" "$LINENO" 5
-          as_fn_error $? "X11 Development package is required in order to build HEASOFT" "$LINENO" 5
-        fi
-      else
-        as_fn_error $? "Required header X11/Intrinsic.h not found in $x_includes" "$LINENO" 5
-        as_fn_error $? "X11 Development package is required in order to build HEASOFT" "$LINENO" 5
-      fi
-    else
-      as_fn_error $? "Required header X11/Xlib.h not found in $x_includes" "$LINENO" 5
-      as_fn_error $? "X11 Development package is required in order to build HEASOFT" "$LINENO" 5
-    fi
-  fi
 
   # X11 libraries: Having a -L path for libX11 is not always necessary,
   # but when passing a value for x_includes to external packages (e.g.