I was informed by Roger Binns that FTS5 is not stable yet. Build with

ghaering · ghaering · commit 37ee7fd3bcc3 · 2015-08-19T02:25:37.000+02:00
FTS3 and FTS4 instead.
diff --git a/setup.py b/setup.py
@@ -139,7 +139,9 @@ def _pkgconfig_library_dirs(self, package):
     def build_extension(self, ext):
         if self.amalgamation:
             ext.define_macros += [
-                    ("SQLITE_ENABLE_FTS5", "1"),
+                    ("SQLITE_ENABLE_FTS3", "1"),
+                    ("SQLITE_ENABLE_FTS3_PARENTHESIS", "1"),
+                    ("SQLITE_ENABLE_FTS4", "1"),
                     ("SQLITE_ENABLE_RTREE", "1")]
             ext.sources.append("sqlite3.c")
         try:
