fixed:

scan.c:734: warning: implicit declaration of function `SilentPrepare'
scan.c:814: warning: implicit declaration of function `ScanMakeFileName'

stdscan.h

@@ -11,6 +11,8 @@
 #ifndef SICSSTDSCAN
 #define SICSSTDSCAN
 
+  char *ScanMakeFileName(SicsInterp *pSics, SConnection *pCon);
+
   /**
     * write the header of the scan file
     */
@@ -30,6 +32,8 @@
     * second version of PrepareScan which does not check scan limits
     */ 
   int NonCheckPrepare(pScanData self);
+  
+  int SilentPrepare(pScanData self);
   /**
     * ScanDrive handles driving to the scan point iPoint.
     */