diff -rupN --no-dereference jasper-version-2.0.33/src/libjasper/jp2/jp2_cod.h jasper-version-2.0.33-new/src/libjasper/jp2/jp2_cod.h
--- jasper-version-2.0.33/src/libjasper/jp2/jp2_cod.h	2021-08-01 22:50:31.000000000 +0200
+++ jasper-version-2.0.33-new/src/libjasper/jp2/jp2_cod.h	2021-09-01 21:42:55.332371002 +0200
@@ -288,10 +288,10 @@ typedef struct jp2_boxinfo_s {
 * Box class.
 \******************************************************************************/
 
-jp2_box_t *jp2_box_create(int type);
-void jp2_box_destroy(jp2_box_t *box);
-jp2_box_t *jp2_box_get(jas_stream_t *in);
-int jp2_box_put(jp2_box_t *box, jas_stream_t *out);
+JAS_DLLEXPORT jp2_box_t *jp2_box_create(int type);
+JAS_DLLEXPORT void jp2_box_destroy(jp2_box_t *box);
+JAS_DLLEXPORT jp2_box_t *jp2_box_get(jas_stream_t *in);
+JAS_DLLEXPORT int jp2_box_put(jp2_box_t *box, jas_stream_t *out);
 
 JAS_ATTRIBUTE_CONST
 static inline uint_least8_t JP2_DTYPETOBPC(uint_least8_t dtype)