--- chrome/browser/download/download_commands.cc.orig	2018-06-13 00:10:05.000000000 +0200
+++ chrome/browser/download/download_commands.cc	2018-07-14 14:30:03.853964000 +0200
@@ -249,7 +249,7 @@
       return download_item_->GetOpenWhenComplete() ||
              download_crx_util::IsExtensionDownload(*download_item_);
     case ALWAYS_OPEN_TYPE:
-#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX)
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_BSD)
       if (CanOpenPdfInSystemViewer()) {
         DownloadPrefs* prefs = DownloadPrefs::FromBrowserContext(
             content::DownloadItemUtils::GetBrowserContext(download_item_));
@@ -293,7 +293,7 @@
       bool is_checked = IsCommandChecked(ALWAYS_OPEN_TYPE);
       DownloadPrefs* prefs = DownloadPrefs::FromBrowserContext(
           content::DownloadItemUtils::GetBrowserContext(download_item_));
-#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX)
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_BSD)
       if (CanOpenPdfInSystemViewer()) {
         prefs->SetShouldOpenPdfInSystemReader(!is_checked);
         DownloadItemModel(download_item_)
@@ -408,7 +408,7 @@
   return browser_displayer.browser();
 }
 
-#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_BSD)
 bool DownloadCommands::IsDownloadPdf() const {
   base::FilePath path = download_item_->GetTargetFilePath();
   return path.MatchesExtension(FILE_PATH_LITERAL(".pdf"));
@@ -425,7 +425,7 @@
   return IsDownloadPdf() &&
          (IsAdobeReaderDefaultPDFViewer() ? is_adobe_pdf_reader_up_to_date
                                           : true);
-#elif defined(OS_MACOSX) || defined(OS_LINUX)
+#elif defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_BSD)
   return IsDownloadPdf();
 #endif
 }