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-rw-r--r--libstdc++-v3/acconfig.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libstdc++-v3/acconfig.h b/libstdc++-v3/acconfig.h
index 48924791f1a..bc945fcc9df 100644
--- a/libstdc++-v3/acconfig.h
+++ b/libstdc++-v3/acconfig.h
@@ -1,5 +1,8 @@
// acconfig.h symbols and macros for libstdc++ v3 -*- C++ -*-
+// Include support for multiple threads, e.g., in the I/O package.
+#undef _GLIBCPP_USE_THREADS
+
// Include support for 'long long' and 'unsigned long long'.
#undef _GLIBCPP_USE_LONG_LONG
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