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-rw-r--r--src/libmain/shared.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 8f2aa842036a..c27302227304 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -126,6 +126,7 @@ void initNix()
     std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
 #endif
 
+    // FIXME: do we need this? It's not thread-safe.
     std::ios::sync_with_stdio(false);
 
     if (getEnv("IN_SYSTEMD") == "1")