Docs go into /usr/share/doc/e16, we preffer them in /usr/share/doc/${PF}

--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -1,4 +1,4 @@
-e16docdir = ${datadir}/doc/${PACKAGE}
+e16docdir = ${docdir}
 
 EXTRA_DIST = e16.asc e16.man.in e16.html