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diff --git a/config.c b/config.c
index 6477259..c462ed3 100644
--- a/config.c
+++ b/config.c
@@ -114,9 +114,12 @@ cf_check(void)
void
cf_parse(void)
{
- FILE *f = fopen(CONFIG_FILE, "r");
+ char *config_file = getenv("ISOLATE_CONFIG_FILE");
+ if(!config_file)
+ die("ISOLATE_CONFIG_FILE environment variable not set");
+ FILE *f = fopen(config_file, "r");
if (!f)
- die("Cannot open %s: %m", CONFIG_FILE);
+ die("Cannot open %s: %m", config_file);
char line[MAX_LINE_LEN];
while (fgets(line, sizeof(line), f))
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