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--- a/dia2code/dia2code.h
+++ b/dia2code/dia2code.h
@@ -264,8 +264,8 @@ param_list * d2c_parameter_set(char *name, char *value);
char * d2c_parameter_value(char *name);
param_list *d2c_parameter_find(char *name);
-int indent_count;
-int indent_open_brace_on_newline;
-int generate_backup;
+extern int indent_count;
+extern int indent_open_brace_on_newline;
+extern int generate_backup;
#endif
--- a/dia2code/main.c
+++ b/dia2code/main.c
@@ -19,6 +19,7 @@
#include "code_generators.h"
#include "parse_diagram.h"
+int generate_backup;
int process_initialization_file(char *filename, int exit_if_not_found);
#define DEFAULT_TARGET 0
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