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--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -34,7 +34,7 @@
     $(XSLT_CFLAGS) \
     $(X_CFLAGS) \
     -DRECOLL_DATADIR=\"${pkgdatadir}\" \
-    -DREADFILE_ENABLE_ZLIB -DREADFILE_ENABLE_MINIZ \
+    -DREADFILE_ENABLE_ZLIB -DREADFILE_ENABLE_MINIZ -DREADFILE_ENABLE_MD5 \
     -D_GNU_SOURCE \
     $(DEFS)