1 file changed, 4 insertions, 3 deletions
diff --git a/source/filter.c b/source/filter.c
index 6e16537..3ffd077 100644
--- a/source/filter.c
+++ b/source/filter.c
@@ -47,7 +47,8 @@ static int open_exec_filter(struct cgit_filter *base, va_list ap)
 		// cgit ignores SIGPIPE and the disposition survives exec, so a
 		// filter that writes to a closed pipe would otherwise carry on.
 		signal(SIGPIPE, SIG_DFL);
-		execvp(filter->cmd, filter->argv);
+		// execvp leaves argv alone, but its prototype predates const.
+		execvp(filter->cmd, (char *const *)filter->argv);
 		// The child shares the parent's page buffer, cache lock and exit
 		// handlers, so it must not die through them.
 		fprintf(stderr, "[cgit] Unable to exec filter %s: %s\n", filter->cmd, strerror(errno));
@@ -95,7 +96,7 @@ static void cleanup_exec_filter(struct cgit_filter *base)
 
 	free(filter->argv);
 	filter->argv = NULL;
-	free(filter->cmd);
+	free((char *)filter->cmd);
 	filter->cmd = NULL;
 }
 
@@ -116,7 +117,7 @@ static struct cgit_filter *new_exec_filter(const char *cmd, int argument_count)
 	return &filter->base;
 }
 
-void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv)
+void cgit_exec_filter_init(struct cgit_exec_filter *filter, const char *cmd, const char **argv)
 {
 	memset(filter, 0, sizeof(*filter));
 	filter->base.open = open_exec_filter;