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--- a/src/mboxgrep.h
+++ b/src/mboxgrep.h
@@ -129,6 +129,6 @@
 }
 option_t;
 
-option_t config;
+extern option_t config;
 
 #endif /* MBOXGREP_H */
--- a/src/main.c
+++ b/src/main.c
@@ -57,6 +57,7 @@
 int count = 0;
 void *tmpp;
 checksum_t *cs;
+option_t config;
 
 int
 main (int argc, char **argv)