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-rw-r--r--src/afl-fuzz-state.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/afl-fuzz-state.c b/src/afl-fuzz-state.c
index 316f9bd9..99863103 100644
--- a/src/afl-fuzz-state.c
+++ b/src/afl-fuzz-state.c
@@ -313,8 +313,10 @@ void read_afl_environment(afl_state_t *afl, char **envp) {
 
                               afl_environment_variable_len)) {
 
-            afl->afl_env.afl_post_library =
-                (u8 *)get_afl_env(afl_environment_variables[i]);
+            FATAL(
+                "AFL_POST_LIBRARY is deprecated, use "
+                "AFL_CUSTOM_MUTATOR_LIBRARY instead, see "
+                "docs/custom_mutators.md");
 
           } else if (!strncmp(env, "AFL_CUSTOM_MUTATOR_LIBRARY",