--- vlc-3.0.10/modules/codec/omxil/omxil_core.h.orig	2020-04-20 09:19:53.000000000 +0200
+++ vlc-3.0.10/modules/codec/omxil/omxil_core.h	2020-05-20 17:53:47.373898072 +0200
@@ -34,9 +34,9 @@
 extern OMX_ERRORTYPE (*pf_get_roles_of_component)(OMX_STRING, OMX_U32 *, OMX_U8 **);
 
 /* Extra IOMX android functions. Can be NULL if we don't link with libiomx */
-OMX_ERRORTYPE (*pf_enable_graphic_buffers)(OMX_HANDLETYPE, OMX_U32, OMX_BOOL);
-OMX_ERRORTYPE (*pf_get_graphic_buffer_usage)(OMX_HANDLETYPE, OMX_U32, OMX_U32*);
-OMX_ERRORTYPE (*pf_get_hal_format) (const char *, int *);
+extern OMX_ERRORTYPE (*pf_enable_graphic_buffers)(OMX_HANDLETYPE, OMX_U32, OMX_BOOL);
+extern OMX_ERRORTYPE (*pf_get_graphic_buffer_usage)(OMX_HANDLETYPE, OMX_U32, OMX_U32*);
+extern OMX_ERRORTYPE (*pf_get_hal_format) (const char *, int *);
 
 int InitOmxCore(vlc_object_t *p_this);
 void DeinitOmxCore(void);