diff --git a/make.py b/make.py
old mode 100644
new mode 100755
index b44ac93..9ea2baa
--- a/make.py
+++ b/make.py
@@ -34,7 +34,8 @@ out_formats = {
 with open(path_makefile_gen, 'w') as makefile:
     targets_list = list()
     # makefile: skeleton rules
-    makefile.write(".PHONY: all clean stickers/\n")
+    makefile.write(".PHONY: all default clean stickers/\n")
+    makefile.write("default: all\n")
     makefile.write('stickers:\n\tmkdir stickers\n')
     makefile.write('clean:\n\trm -vrf stickers\n')
     for sticker_description_file in path_stickers_data_dir.glob('*.yaml'):
@@ -43,19 +44,19 @@ with open(path_makefile_gen, 'w') as makefile:
             sticker_description = safe_load(yaml_file)
         log.debug("stuff %s", sticker_description)
         target_filename = path_stickers_output_dir \
-                / ( sticker_description['name'] \
-                + '.' \
-                + out_formats[output_ext]['extension'] )
+        / ( sticker_description['name'] \
+        + '.' \
+        + out_formats[output_ext]['extension'] )
+        prerequisite_filename=f"{sticker_description_file} "
         if sticker_description['input']['base'].get('format','') \
-                not in ('lavfi', 'image2'):
-            prerequisite_filename = str(path_stickers_source_dir \
-                / sticker_description['input']['base']['input'])
-        else:
-            prerequisite_filename = ''
+        not in ('lavfi', 'image2'):
+            prerequisite_filename += str(
+                    path_stickers_source_dir \
+                    / sticker_description['input']['base']['input']
+            ).replace(' ', '\\ ')
         targets_list.append(f"{target_filename}")
         # makefile: rule declaration
-        escaped_prereq = prerequisite_filename.replace(' ', '\\ ')
-        makefile.write(f"{target_filename}: {escaped_prereq} | stickers\n")
+        makefile.write(f"{target_filename}: {prerequisite_filename} | stickers\n")
         # makefile: recipe ffmpeg base
         makefile.write('\tffmpeg ')
         # makefile: specify format if present