--- gtk-doc-1.33.2/gtkdoc/mkdb.py	2021-01-20 01:08:26.503552400 +0800
+++ gtk-doc-1.33.2_bak/gtkdoc/mkdb.py	2021-07-26 10:50:13.896786712 +0800
@@ -25,7 +25,7 @@
 
 from collections import OrderedDict
 import logging
-import os
+import os,sys
 import re
 import string
 
@@ -286,7 +286,11 @@
 
     # extract docbook header or define default
     doctype_header = GetDocbookHeader(main_sgml_file)
-
+    
+    if not os.path.exists(os.path.join(ROOT_DIR, MODULE + "-sections.txt")):
+         print (os.path.join(ROOT_DIR, MODULE + "-sections.txt") + "  file is not found")
+         sys.exit()
+    
     ReadKnownSymbols(os.path.join(ROOT_DIR, MODULE + "-sections.txt"))
     ReadSignalsFile(os.path.join(ROOT_DIR, MODULE + ".signals"))
     ReadArgsFile(os.path.join(ROOT_DIR, MODULE + ".args"))
@@ -294,9 +298,19 @@
     obj_tree = ReadObjectHierarchy(os.path.join(ROOT_DIR, MODULE + ".hierarchy"))
     ReadInterfaces(os.path.join(ROOT_DIR, MODULE + ".interfaces"))
     ReadPrerequisites(os.path.join(ROOT_DIR, MODULE + ".prerequisites"))
+    
+    
+    if not os.path.exists(os.path.join(ROOT_DIR, MODULE + "-decl.txt")):
+        print (os.path.join(ROOT_DIR, MODULE + "-decl.txt") + " file is not found")
+        sys.exit()
 
     ReadDeclarationsFile(os.path.join(ROOT_DIR, MODULE + "-decl.txt"), 0)
     if os.path.isfile(os.path.join(ROOT_DIR, MODULE + "-overrides.txt")):
+        
+        if not  os.path.exists(os.path.join(ROOT_DIR, MODULE + "-overrides.txt")):
+            print (os.path.join(ROOT_DIR, MODULE + "-overrides.txt") + " file is not found")
+            sys.exit()
+
         ReadDeclarationsFile(os.path.join(ROOT_DIR, MODULE + "-overrides.txt"), 1)
 
     logging.info("Data files read")
@@ -3758,6 +3772,12 @@
     # This array holds any subdirectories found.
     subdirs = []
 
+
+ 
+    if not os.path.isdir(source_dir):
+        print (source_dir + " directory is not found")
+        sys.exit()
+
     for ifile in sorted(os.listdir(source_dir)):
         logging.debug("... : %s", ifile)
         if ifile.startswith('.'):