Index: dovecot-2.3.5/src/lib-fts/fts-filter-stemmer-snowball.c
===================================================================
--- dovecot-2.3.5/src/lib-fts/fts-filter-stemmer-snowball.c
+++ dovecot-2.3.5/src/lib-fts/fts-filter-stemmer-snowball.c	2019-03-06 08:49:45.262581897 +0100
@@ -6,7 +6,7 @@
 
 #ifdef HAVE_FTS_STEMMER
 
-#include <libstemmer.h>
+#include <libstemmer/libstemmer.h>
 
 struct fts_filter_stemmer_snowball {
 	struct fts_filter filter;
Index: dovecot-2.3.5/src/plugins/fts-lucene/SnowballFilter.h
===================================================================
--- dovecot-2.3.5/src/plugins/fts-lucene/SnowballFilter.h
+++ dovecot-2.3.5/src/plugins/fts-lucene/SnowballFilter.h	2019-03-06 08:50:19.392622215 +0100
@@ -8,7 +8,7 @@
 #define _lucene_analysis_snowball_filter_
 
 #include "CLucene/analysis/AnalysisHeader.h"
-#include "libstemmer.h"
+#include "libstemmer/libstemmer.h"
 
 CL_NS_DEF2(analysis,snowball)