Add missing QPDF_DLL_CLASS for QPDFObject (fixes #424)

This is needed for some compilers on some platforms, notably current
versions of clang.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/qpdf/QPDFObject.hh b/include/qpdf/QPDFObject.hh
index fa4452e0..20242366 100644
--- a/include/qpdf/QPDFObject.hh
+++ b/include/qpdf/QPDFObject.hh
@@ -31,7 +31,7 @@
 class QPDF;
 class QPDFObjectHandle;
 
-class QPDFObject
+class QPDF_DLL_CLASS QPDFObject
 {
   public:
     QPDFObject();