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-rw-r--r--perlvars.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/perlvars.h b/perlvars.h
index 5a351a060b..24ff324c15 100644
--- a/perlvars.h
+++ b/perlvars.h
@@ -104,6 +104,7 @@ PERLVARI(G, mmap_page_size, IV, 0)
#if defined(USE_ITHREADS)
PERLVAR(G, hints_mutex, perl_mutex) /* Mutex for refcounted he refcounting */
+PERLVAR(G, env_mutex, perl_mutex) /* Mutex for accessing ENV */
# if ! defined(USE_THREAD_SAFE_LOCALE) || defined(TS_W32_BROKEN_LOCALECONV)
PERLVAR(G, locale_mutex, perl_mutex) /* Mutex for setlocale() changing */
# endif