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-rw-r--r--config-daemon.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/config-daemon.ac b/config-daemon.ac
index 072fb84b46..28cae23b9d 100644
--- a/config-daemon.ac
+++ b/config-daemon.ac
@@ -73,7 +73,7 @@ if test "x$guix_build_daemon" = "xyes"; then
dnl Chroot support.
AC_CHECK_FUNCS([chroot unshare])
- AC_CHECK_HEADERS([sched.h sys/param.h sys/mount.h])
+ AC_CHECK_HEADERS([sched.h sys/param.h sys/mount.h tr1/unordered_set])
dnl lutimes and lchown: used when canonicalizing store items.
dnl posix_fallocate: used when extracting archives.