diff --git a/api/graphics_api.h b/api/graphics_api.h
index 8ac3db1f96..89be6052c0 100755
--- a/api/graphics_api.h
+++ b/api/graphics_api.h
@@ -26,7 +26,6 @@ extern void boinc_app_key_release(int, int);
 
 // Implementation stuff
 //
-extern int boinc_init_graphics(void (*worker)());
 extern double boinc_max_fps;
 extern double boinc_max_gfx_cpu_frac;
 extern bool throttled_app_render(int, int, double);
diff --git a/checkin_notes b/checkin_notes
index 05e20e56f6..6d24828212 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -18963,3 +18963,12 @@ Eric   28 Oct 2004
     	file_upload_handler.C
     tools/
     	Makefile.am
+
+David  29 Oct 2004
+    - update_versions looks for .sig files for single-file applications
+        (from Eric Myers)
+
+    api/
+        graphics_api.h
+    tools/
+        update_versions
diff --git a/doc/graphics.php b/doc/graphics.php
index e67a8a33dd..0b3535eed3 100644
--- a/doc/graphics.php
+++ b/doc/graphics.php
@@ -15,6 +15,10 @@ Applications that provide graphics must call either
 </pre>
 where <code>worker()</code> is the main function of your application.
 Do NOT call boinc_init() or boinc_init_options().
+<p>
+Unix/Linux applications that use graphics should compile
+all files with -D_REENTRANT,
+since graphics uses multiple threads.
 
 <h3>Static graphics</h3>
 <p>
diff --git a/tools/update_versions b/tools/update_versions
index d918b640ba..688b1a9b93 100755
--- a/tools/update_versions
+++ b/tools/update_versions
@@ -145,6 +145,8 @@ def add_files(app, match, exec_file, non_exec_files=[],
 
     objects_to_commit.append(object)
 
+# Return a match if the filename is a possible exec file name (or installer)
+
 def re_match_exec_filename(filepath):
     file = os.path.basename(filepath)
     return re.match('[^.]+_([0-9]+)[.]([0-9]+)_([^.]+?(?:[0-9][0-9.]*[0-9])?)(?:[.]gz|[.]exe|[.]sit|[.]msi)?$', file)
@@ -163,9 +165,15 @@ def find_versions(app, dir):
     """
 
     for filepath in xlistdir(dir):
+        # ignore symlinks
         if os.path.islink(filepath):
-            # ignore symlinks
             continue
+
+        # ignore signature files
+        if filepath.endswith('.sig'):
+            continue
+
+        # look for an executable file (proper .ext at end)
         match = re_match_exec_filename(filepath)
         if not match:
             print >>sys.stderr, "  Ignoring unknown file", filepath
@@ -175,12 +183,28 @@ def find_versions(app, dir):
         else:
             find_versions__process_single_file(app, match, filepath)
 
+# Process an app that is a single file only, possibly with
+# a signature file included.  Could also be the core client.
+#
 def find_versions__process_single_file(app, match, filepath):
-     '''add a single executable as app/core version'''
-     add_files(app=app, match=match, exec_file=filepath,
-               min_core_version = min_core_version
-               )
+    '''add a single executable as app/core version'''
+    # Find signature file, if it exists.
+    signature_files={}
+    sig_file = filepath + ".sig"
+    if os.path.isfile(sig_file):
+        signature_files[filepath] = sig_file
 
+    add_files(app             = app,
+             match            = match,
+             exec_file        = filepath,
+             signature_files  = signature_files,
+             min_core_version = min_core_version,
+             )
+
+
+# Process an app that is a bundle of files in a directory of the same name,
+# possibly with signature files included.
+ 
 def find_versions__process_bundle(app, match, dir):
     '''add executable + bundle as app/core version'''
     exec_file = None
@@ -227,17 +251,22 @@ def find_versions__process_bundle(app, match, dir):
               min_core_version = min_core_version
               )
 
+####################
+# BEGIN:
+
 for appdir in xlistdir(config.app_dir):
     if not os.path.isdir(appdir): continue
     dirname = os.path.basename(appdir)
     if dirname == 'boinc':
-        print "Looking for core versions in", appdir
+        if verbose:
+            print "Looking for core versions in", appdir
         find_versions(None, appdir)
         continue
     appname = os.path.basename(appdir)
     apps = database.Apps.find(name=appname)
     if apps:
-        print "Looking for %s versions in"%apps[0], appdir
+        if verbose:
+            print "Looking for %s versions in"%apps[0], appdir
         find_versions(apps[0], appdir)
         continue