From: Evangelos Foutras <evangelos@foutrelis.com>
Date: Mon, 1 Nov 2021 21:45:38 +0200
Subject: [PATCH] Fix build with poppler 21.11.0

GfxFont::tag is now of type std::string instead of GooString *.
--- a/src/extension/internal/pdfinput/pdf-parser.cpp
+++ b/src/extension/internal/pdfinput/pdf-parser.cpp
@@ -2169,7 +2169,11 @@ void PdfParser::opSetFont(Object args[], int /*numArgs*/)
   }
   if (printCommands) {
     printf("  font: tag=%s name='%s' %g\n",
+#if POPPLER_CHECK_VERSION(21,11,0)
+	   font->getTag().c_str(),
+#else
 	   font->getTag()->getCString(),
+#endif
 	   font->getName() ? font->getName()->getCString() : "???",
 	   args[1].getNum());
     fflush(stdout);
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