fix "not found" build problem with older pangoes

diff --git a/src/extension/internal/pdf-cairo.cpp b/src/extension/internal/pdf-cairo.cpp
index b8f4eddf1645c25a95c47193cb026d17ffdb8a78..a79bb2a01e74c7840818da5738baccfc4cb3def7 100644 (file)
--- a/src/extension/internal/pdf-cairo.cpp
+++ b/src/extension/internal/pdf-cairo.cpp
@@ -767,10 +767,12 @@ PrintCairoPDF::draw_glyphs(cairo_t *cr, NR::Point p, PangoFont *font, PangoGlyph
     for (gint i = 0; i < glyph_string->num_glyphs; i++) {
         info = &glyph_string->glyphs[i];
         // skip empty or unknown glyphs
+#if defined(PANGO_GLYPH_EMPTY) && defined(PANGO_GLYPH_UNKNOWN_FLAG)
         if (info->glyph == PANGO_GLYPH_EMPTY || info->glyph & PANGO_GLYPH_UNKNOWN_FLAG) {
             num_invalid_glyphs++;
             continue;
         }
+#endif
         glyphs[i - num_invalid_glyphs].index = info->glyph;
         glyphs[i - num_invalid_glyphs].x = p[NR::X] + (x_offset + info->geometry.x_offset)/PANGO_SCALE;
         glyphs[i - num_invalid_glyphs].y = p[NR::Y] + (y_offset + info->geometry.y_offset)/PANGO_SCALE;