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-rw-r--r--features/mkc_imp.f_RB.mk4
1 files changed, 4 insertions, 0 deletions
diff --git a/features/mkc_imp.f_RB.mk b/features/mkc_imp.f_RB.mk
index 57839ed..5661efd 100644
--- a/features/mkc_imp.f_RB.mk
+++ b/features/mkc_imp.f_RB.mk
@@ -2,6 +2,10 @@
#
# See LICENSE file in the distribution.
############################################################
+.ifndef _MKC_IMP_F_RB_MK
+_MKC_IMP_F_RB_MK := 1
MKC_CHECK_DEFINES += RB_ENTRY:sys/tree.h
MKC_CHECK_DEFINES += SPLAY_ENTRY:sys/tree.h
+
+.endif # _MKC_IMP_F_RB_MK