root@bt:~# cat gnuradio_gri_wav-v0.1.patch 
--- gnuradio/gnuradio-core/src/lib/io/gri_wavfile.h	2012-06-08 19:14:37.901973650 -0400
+++ /media/PENDRIVE/gnuradio.built.withfix/gnuradio-core/src/lib/io/gri_wavfile.h	2012-06-08 17:48:36.000000000 -0400
@@ -46,7 +46,7 @@
  * \return True on a successful read, false if the file could not be read or is
  *         not a valid WAV file.
  */
-bool
+GR_CORE_API bool
 gri_wavheader_parse(FILE *fp,
 		    unsigned int &sample_rate,
 		    int &nchans,
@@ -60,7 +60,7 @@
  *
  * Takes care of endianness.
  */
-short int
+GR_CORE_API short int
 gri_wav_read_sample(FILE *fp, int bytes_per_sample);
 
 
@@ -71,7 +71,7 @@
  * a-priori (file and chunk lengths). Use gri_wavheader_complete() to fill
  * these in.
  */
-bool
+GR_CORE_API bool
 gri_wavheader_write(FILE *fp,
 		 unsigned int sample_rate,
 		 int nchans,
@@ -82,7 +82,7 @@
  *
  * Takes care of endianness.
  */
-void
+GR_CORE_API void
 gri_wav_write_sample(FILE *fp, short int sample, int bytes_per_sample);
 
 
@@ -97,5 +97,5 @@
  * \p fp File pointer to an open WAV file with a blank header
  * \p byte_count Length of all samples written to the file in bytes.
  */
-bool
+GR_CORE_API bool
 gri_wavheader_complete(FILE *fp, unsigned int byte_count);