diff -rupN jasper-version-2.0.16/src/libjasper/include/jasper/jas_image.h jasper-version-2.0.16-new/src/libjasper/include/jasper/jas_image.h
--- jasper-version-2.0.16/src/libjasper/include/jasper/jas_image.h	2019-03-12 19:04:35.000000000 +0100
+++ jasper-version-2.0.16-new/src/libjasper/include/jasper/jas_image.h	2019-11-13 21:46:30.322873908 +0100
@@ -496,10 +496,10 @@ int jas_image_ishomosamp(jas_image_t *im
 int jas_image_sampcmpt(jas_image_t *image, int cmptno, int newcmptno,
   jas_image_coord_t ho, jas_image_coord_t vo, jas_image_coord_t hs,
   jas_image_coord_t vs, int sgnd, int prec);
-int jas_image_writecmpt2(jas_image_t *image, int cmptno, jas_image_coord_t x,
+JAS_DLLEXPORT int jas_image_writecmpt2(jas_image_t *image, int cmptno, jas_image_coord_t x,
   jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height,
   long *buf);
-int jas_image_readcmpt2(jas_image_t *image, int cmptno, jas_image_coord_t x,
+JAS_DLLEXPORT int jas_image_readcmpt2(jas_image_t *image, int cmptno, jas_image_coord_t x,
   jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height,
   long *buf);
 
@@ -549,23 +549,23 @@ int bmp_validate(jas_stream_t *in);
 
 #if !defined(EXCLUDE_JP2_SUPPORT)
 /* Format-dependent operations for JP2 support. */
-jas_image_t *jp2_decode(jas_stream_t *in, const char *optstr);
-int jp2_encode(jas_image_t *image, jas_stream_t *out, const char *optstr);
-int jp2_validate(jas_stream_t *in);
+JAS_DLLEXPORT jas_image_t *jp2_decode(jas_stream_t *in, const char *optstr);
+JAS_DLLEXPORT int jp2_encode(jas_image_t *image, jas_stream_t *out, const char *optstr);
+JAS_DLLEXPORT int jp2_validate(jas_stream_t *in);
 #endif
 
 #if !defined(EXCLUDE_JPC_SUPPORT)
 /* Format-dependent operations for JPEG-2000 code stream support. */
-jas_image_t *jpc_decode(jas_stream_t *in, const char *optstr);
-int jpc_encode(jas_image_t *image, jas_stream_t *out, const char *optstr);
-int jpc_validate(jas_stream_t *in);
+JAS_DLLEXPORT jas_image_t *jpc_decode(jas_stream_t *in, const char *optstr);
+JAS_DLLEXPORT int jpc_encode(jas_image_t *image, jas_stream_t *out, const char *optstr);
+JAS_DLLEXPORT int jpc_validate(jas_stream_t *in);
 #endif
 
 #if !defined(EXCLUDE_PGX_SUPPORT)
 /* Format-dependent operations for PGX support. */
-jas_image_t *pgx_decode(jas_stream_t *in, const char *optstr);
-int pgx_encode(jas_image_t *image, jas_stream_t *out, const char *optstr);
-int pgx_validate(jas_stream_t *in);
+JAS_DLLEXPORT jas_image_t *pgx_decode(jas_stream_t *in, const char *optstr);
+JAS_DLLEXPORT int pgx_encode(jas_image_t *image, jas_stream_t *out, const char *optstr);
+JAS_DLLEXPORT int pgx_validate(jas_stream_t *in);
 #endif
 
 #ifdef __cplusplus