--- a/src/sch/schwrite.c
+++ b/src/sch/schwrite.c
@@ -21,7 +21,7 @@
 --------------------------------------------------------------------------------------------------*/
 #include "sch.h"
 
-FILE *schFile;
+extern FILE *schFile;
 
 /*--------------------------------------------------------------------------------------------------
   Write to schFile.
--- a/src/spice/cir.h
+++ b/src/spice/cir.h
@@ -36,5 +36,5 @@
 extern void cirwarn(char *message, ...);
 
 /* Attribute symbols */
-utSym cirGraphicalSym, cirNetSym, cirSpiceTypeSym, cirSpiceTextSym;
+extern utSym cirGraphicalSym, cirNetSym, cirSpiceTypeSym, cirSpiceTextSym;
 
--- a/src/spice/cirwrite.c
+++ b/src/spice/cirwrite.c
@@ -29,6 +29,7 @@
 FILE *cirFile;
 uint32 cirLineNum;
 cirRoot cirTheRoot;
+utSym cirGraphicalSym, cirNetSym, cirSpiceTypeSym, cirSpiceTextSym;
 
 static char *cirLine;
 static uint32 cirLinePos, cirLineSize, cirLastBreakPos;