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diff --git a/compiler/app/ViewerDist.hs b/compiler/app/ViewerDist.hs
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+-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2021  Pacien TRAN-GIRARD
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU Affero General Public License for more details.
+--
+-- You should have received a copy of the GNU Affero General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+{-# LANGUAGE CPP #-}
+
+module ViewerDist where
+
+#ifndef FLAG_PORTABLE
+
+import Paths_ldgallery_compiler (getDataFileName)
+
+viewerDistPath = getDataFileName "viewer"
+
+#else
+
+import Data.Functor ((<&>))
+import System.FilePath (takeDirectory, (</>))
+import System.Environment (getExecutablePath)
+
+viewerDistPath = fmap takeDirectory getExecutablePath <&> (</> "viewer")
+
+#endif
+
+viewerDistPath :: IO FilePath