Because of obsolescence in the pip version of python-epub, bundled https://bitbucket.org/arthurdarcet/epub at 120:8730e6da19f2 (zip file in filters/ directory)

src/Makefile.am

@@ -694,6 +694,7 @@ filters/ppt-dump.py \
 filters/xls-dump.py \
 filters/xlsxmltocsv.py \
 filters/msodump.zip \
+filters/recollepub.zip \
 python/recoll/recoll/conftree.py \
 python/recoll/recoll/rclconfig.py 
 
@@ -701,7 +702,7 @@ install-data-hook:
 	(cd $(DESTDIR)/$(filterdir); \
 	chmod a+x rcl* ppt-dump.py xls-dump.py xlsxmltocsv.py hotrecoll.py; \
 	chmod a+x recoll-we-move-files.py; \
-	chmod 0644 msodump.zip rclexecm.py rcllatinstops.zip \
+	chmod 0644 msodump.zip recollepub.zip rclexecm.py rcllatinstops.zip \
         rclconfig.py conftree.py rclmidi.py)
 
 if MAKEUSERDOC

src/filters/rclepub

@@ -12,6 +12,7 @@ import subprocess
 import rclexecm
 import rclconfig
 
+sys.path.append(sys.path[0]+"/recollepub.zip")
 try:
     import epub
 except: