Fix build faiure on gcc-10 (defaults to -fno-common).
--- a/src/omx_reference_resource_manager.c
+++ b/src/omx_reference_resource_manager.c
@@ -30,6 +30,11 @@
 #include "base/omx_base_component.h"
 #include "queue.h"
 
+int globalIndex;
+NameIndexType *listOfcomponentRegistered;
+ComponentListType **globalComponentList;
+ComponentListType **globalWaitingComponentList;
+
 /**
  * This is the static base pointer of the list
  */
--- a/src/omx_reference_resource_manager.h
+++ b/src/omx_reference_resource_manager.h
@@ -49,10 +49,10 @@ struct NameIndexType {
 };
 
 
-int globalIndex;
-NameIndexType *listOfcomponentRegistered;
-ComponentListType **globalComponentList;
-ComponentListType **globalWaitingComponentList;
+extern int globalIndex;
+extern NameIndexType *listOfcomponentRegistered;
+extern ComponentListType **globalComponentList;
+extern ComponentListType **globalWaitingComponentList;
 
 OMX_ERRORTYPE RM_RegisterComponent(char *name, int max_components);
 OMX_ERRORTYPE addElemToList(ComponentListType **list, OMX_COMPONENTTYPE *openmaxStandComp, int index, OMX_BOOL bIsWaiting);