diff -Naur sox-14.4.2-orig/src/Makefile.am sox-14.4.2/src/Makefile.am
--- sox-14.4.2-orig/src/Makefile.am	2015-04-08 17:11:09.555343005 -0400
+++ sox-14.4.2/src/Makefile.am	2015-04-08 17:11:25.115317153 -0400
@@ -95,7 +95,7 @@
 
 libsox_la_CFLAGS = @WARN_CFLAGS@
 libsox_la_LDFLAGS = @APP_LDFLAGS@ -version-info @SHLIB_VERSION@ \
-  -export-symbols-regex '^(sox_.*|lsx_(check_read_params|(close|open)_dllibrary|(debug(_more|_most)?|fail|report|warn)_impl|eof|fail_errno|filelength|find_(enum_(text|value)|file_extension)|getopt(_init)?|lpc10_(create_(de|en)coder_state|(de|en)code)|raw(read|write)|read(_b_buf|buf|chars)|realloc|rewind|seeki|sigfigs3p?|strcasecmp|tell|unreadb|write(b|_b_buf|buf|s)))$$'
+  -export-symbols-regex '^(sox_.*|lsx_(error|flush|check_read_params|(close|open)_dllibrary|(debug(_more|_most)?|fail|report|warn)_impl|eof|fail_errno|filelength|find_(enum_(text|value)|file_extension)|getopt(_init)?|lpc10_(create_(de|en)coder_state|(de|en)code)|raw(read|write)|read(_b_buf|buf|chars)|realloc|rewind|seeki|sigfigs3p?|strcasecmp|tell|unreadb|write(b|_b_buf|buf|s)))$$'
 
 if HAVE_WIN32_LTDL
   libsox_la_SOURCES += win32-ltdl.c win32-ltdl.h