Compile with -fno-common
https://github.com/ggreer/the_silver_searcher/commit/21eaa1c4160b868b0c5bbf59da17974429f30055

Index: src/options.h
--- src/options.h.orig
+++ src/options.h
@@ -91,7 +91,7 @@ typedef struct {
 } cli_options;
 
 /* global options. parse_options gives it sane values, everything else reads from it */
-cli_options opts;
+extern cli_options opts;
 
 typedef struct option option_t;
 
