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-rw-r--r--src/libmain/shared.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index d3dbfbc44..81fb6b05a 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -155,7 +155,7 @@ void initNix()
sshd). This breaks build users because they don't have access
to the TMPDIR, in particular in ‘nix-store --serve’. */
#if __APPLE__
- if (getuid() == 0 && hasPrefix(getEnv("TMPDIR"), "/var/folders/"))
+ if (getuid() == 0 && hasPrefix(getEnv("TMPDIR").value_or("/tmp"), "/var/folders/"))
unsetenv("TMPDIR");
#endif
}