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-rw-r--r--libguile/options.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/options.h b/libguile/options.h
index 499bfddbe..b79d24eca 100644
--- a/libguile/options.h
+++ b/libguile/options.h
@@ -64,7 +64,7 @@ typedef struct scm_option
#define SCM_OPTION_SCM 2
-extern SCM scm_options SCM_P ((SCM new_mode, scm_option options[], int n, char *s));
+extern SCM scm_options SCM_P ((SCM new_mode, scm_option options[], int n, const char *s));
extern void scm_init_opts SCM_P ((SCM (*func) (SCM), scm_option options[], int n));
extern void scm_init_options SCM_P ((void));