Add DL_IMPORT(returntype) for all officially exported functions.
diff --git a/Include/pgenheaders.h b/Include/pgenheaders.h
index ecfa89b..3148391 100644
--- a/Include/pgenheaders.h
+++ b/Include/pgenheaders.h
@@ -62,12 +62,12 @@
#include "pydebug.h"
#ifdef HAVE_STDARG_PROTOTYPES
-void PySys_WriteStdout(const char *format, ...);
-void PySys_WriteStderr(const char *format, ...);
+DL_IMPORT(void) PySys_WriteStdout(const char *format, ...);
+DL_IMPORT(void) PySys_WriteStderr(const char *format, ...);
#else
/* Better to have no prototypes at all for varargs functions in this case */
-void PySys_WriteStdout();
-void PySys_WriteStderr();
+DL_IMPORT(void) PySys_WriteStdout();
+DL_IMPORT(void) PySys_WriteStderr();
#endif
#define addarc _Py_addarc