diff --git a/Makefile.am b/Makefile.am
index c8d07eab09..c658fc0715 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -155,7 +155,7 @@ CORE_LIBS+=libfreeswitch_spandsp.la
 lib_LTLIBRARIES	         = libfreeswitch.la
 libfreeswitch_la_CFLAGS  = $(CORE_CFLAGS) $(SQLITE_CFLAGS) $(CURL_CFLAGS) $(PCRE_CFLAGS) $(SPEEX_CFLAGS) $(LIBEDIT_CFLAGS) $(openssl_CFLAGS) $(AM_CFLAGS)
 libfreeswitch_la_LDFLAGS = -version-info 1:0:0 $(AM_LDFLAGS) $(PLATFORM_CORE_LDFLAGS) -no-undefined
-libfreeswitch_la_LIBADD  = $(CORE_LIBS) $(APR_LIBS) $(SQLITE_LIBS) $(CURL_LIBS) $(PCRE_LIBS) $(SPEEX_LIBS) $(LIBEDIT_LIBS) $(openssl_LIBS) $(PLATFORM_CORE_LIBS)
+libfreeswitch_la_LIBADD  = $(CORE_LIBS) $(APR_LIBS) $(SQLITE_LIBS) $(CURL_LIBS) $(PCRE_LIBS) $(SPEEX_LIBS) $(LIBEDIT_LIBS) $(openssl_LIBS) $(VPX_LIBS) $(PLATFORM_CORE_LIBS)
 libfreeswitch_la_DEPENDENCIES = $(BUILT_SOURCES)
 
 if HAVE_ODBC
diff --git a/configure.ac b/configure.ac
index 7f87ef07d1..35dfb58af2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1213,12 +1213,14 @@ PKG_CHECK_MODULES([LDNS], [libldns >= 1.6.6],[
 
 PKG_CHECK_MODULES([VPX], [vpx >= 1.3.0],[
   AM_CONDITIONAL([HAVE_VPX],[true])],[
+  AC_CHECK_LIB([vpx], [vpx_codec_vp9_cx_algo], [VPX_LIBS=-lvpx])
+  AS_IF([test -z "$VPX_LIBS"],[
     if module_enabled mod_vpx; then
       AC_MSG_ERROR([You need to either install libvpx-dev or disable mod_vpx in modules.conf])
     else
       AC_MSG_RESULT([no]); AM_CONDITIONAL([HAVE_VPX],[false])
     fi],[
-    AM_CONDITIONAL([HAVE_VPX],[true])])
+    AM_CONDITIONAL([HAVE_VPX],[true])])])
 
 #PKG_CHECK_MODULES([AVCODEC], [avcodec >= 53.35.0])
 #PKG_CHECK_MODULES([AVFORMAT], [avformat >= 53.21.1])
diff --git a/src/include/private/switch_core_pvt.h b/src/include/private/switch_core_pvt.h
index f1d7dfed12..3ff631453b 100644
--- a/src/include/private/switch_core_pvt.h
+++ b/src/include/private/switch_core_pvt.h
@@ -103,8 +103,6 @@ typedef enum {
 	SSF_MEDIA_BUG_TAP_ONLY = (1 << 10)
 } switch_session_flag_t;
 
-typedef switch_status_t (switch_core_video_thread_callback_func_t) (switch_core_session_t *session, switch_frame_t *frame, void *user_data);
-
 struct switch_core_session {
 	switch_memory_pool_t *pool;
 	switch_thread_t *thread;
diff --git a/src/include/switch_core.h b/src/include/switch_core.h
index 0ace87d288..330b6c9e9c 100644
--- a/src/include/switch_core.h
+++ b/src/include/switch_core.h
@@ -169,8 +169,7 @@ typedef enum {
 	DS_INVALID,
 } dtls_state_t;
 
-
-
+typedef switch_status_t (switch_core_video_thread_callback_func_t) (switch_core_session_t *session, switch_frame_t *frame, void *user_data);
 
 
 
@@ -2317,7 +2316,7 @@ SWITCH_DECLARE(uint8_t) switch_core_session_check_interface(switch_core_session_
   Return SWITCH_STATUS_BREAK will break the loop and end the video thread
 */
 
-SWITCH_DECLARE(switch_status_t) switch_core_session_set_video_thread_callback(switch_core_session_t *session, void *func, void *user_data);
+SWITCH_DECLARE(switch_status_t) switch_core_session_set_video_thread_callback(switch_core_session_t *session, switch_core_video_thread_callback_func_t *func, void *user_data);
 
 /*!
   \brief Set a callback to let the core video thread call us
diff --git a/src/mod/applications/mod_conference/mod_conference.c b/src/mod/applications/mod_conference/mod_conference.c
index 53a240a1b4..802f7a27b6 100644
--- a/src/mod/applications/mod_conference/mod_conference.c
+++ b/src/mod/applications/mod_conference/mod_conference.c
@@ -9781,7 +9781,7 @@ SWITCH_STANDARD_APP(conference_function)
 	switch_core_session_receive_message(session, &msg);
 
 	/* Chime in the core video thread */
-	switch_core_session_set_video_thread_callback(session, (void *)video_thread_callback, (void *)&member);
+	switch_core_session_set_video_thread_callback(session, video_thread_callback, (void *)&member);
 
 	/* Run the conference loop */
 	do {
diff --git a/src/switch_core_session.c b/src/switch_core_session.c
index 8bf3c710b6..76ca5a9e81 100644
--- a/src/switch_core_session.c
+++ b/src/switch_core_session.c
@@ -3063,7 +3063,7 @@ SWITCH_DECLARE(void) switch_core_session_debug_pool(switch_stream_handle_t *stre
 		session_manager.running, session_manager.busy, session_manager.popping);
 }
 
-SWITCH_DECLARE(switch_status_t) switch_core_session_set_video_thread_callback(switch_core_session_t *session, void *func, void *user_data)
+SWITCH_DECLARE(switch_status_t) switch_core_session_set_video_thread_callback(switch_core_session_t *session, switch_core_video_thread_callback_func_t *func, void *user_data)
 {
 	if (!func) {
 		session->_video_thread_callback = NULL;