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diff --git a/vl/generic.c b/vl/generic.c
index c6f84a9..8617ed2 100644
--- a/vl/generic.c
+++ b/vl/generic.c
@@ -1513,13 +1513,13 @@ vl_thread_specific_state_delete (VlThreadState * self)
*/
#if (defined(VL_OS_LINUX) || defined(VL_OS_MACOSX)) && defined(VL_COMPILER_GNUC)
-static void vl_constructor () __attribute__ ((constructor)) ;
-static void vl_destructor () __attribute__ ((destructor)) ;
+//static void vl_constructor () __attribute__ ((constructor)) ;
+//static void vl_destructor () __attribute__ ((destructor)) ;
#endif
#if defined(VL_OS_WIN)
-static void vl_constructor () ;
-static void vl_destructor () ;
+//static void vl_constructor () ;
+//static void vl_destructor () ;
BOOL WINAPI DllMain(
HINSTANCE hinstDLL, // handle to DLL module
@@ -1563,7 +1563,7 @@ BOOL WINAPI DllMain(
/* ---------------------------------------------------------------- */
/** @internal @brief Initialize VLFeat state */
-static void
+void
vl_constructor (void)
{
VlState * state ;
@@ -1637,7 +1637,7 @@ vl_constructor (void)
}
/** @internal @brief Destruct VLFeat */
-static void
+void
vl_destructor ()
{
VlState * state ;
diff --git a/vl/generic.h b/vl/generic.h
index 4ef87f2..30a974e 100644
--- a/vl/generic.h
+++ b/vl/generic.h
@@ -206,5 +206,7 @@ VL_EXPORT double vl_toc (void) ;
VL_EXPORT double vl_get_cpu_time (void) ;
/** @} */
+VL_EXPORT void vl_constructor();
+VL_EXPORT void vl_destructor();
/* VL_GENERIC_H */
#endif
diff --git a/vl/sift.c b/vl/sift.c
index 03963fe..6477a81 100644
--- a/vl/sift.c
+++ b/vl/sift.c
@@ -1443,7 +1443,7 @@ vl_sift_detect (VlSiftFilt * f)
** @remark The minimum octave size is 2x2xS.
**/
-static void
+void
update_gradient (VlSiftFilt *f)
{
int s_min = f->s_min ;
diff --git a/vl/sift.h b/vl/sift.h
index 50e03f4..f9558ad 100644
--- a/vl/sift.h
+++ b/vl/sift.h
@@ -138,7 +138,8 @@ void vl_sift_keypoint_init (VlSiftFilt const *f,
double y,
double sigma) ;
/** @} */
-
+VL_EXPORT
+void update_gradient(VlSiftFilt* f);
/** @name Retrieve data and parameters
** @{
**/
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