From 8eb4eec7d28eaa8950be95b05cfd551897b4b69a Mon Sep 17 00:00:00 2001
From: Andrew Johnson <anj@aps.anl.gov>
Date: Sat, 3 Mar 2018 17:17:34 -0600
Subject: [PATCH] Corrected fix from Bruce Hill's Github PR#19

---
 configure/RULES_BUILD | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/configure/RULES_BUILD b/configure/RULES_BUILD
index 6d2a5cd55..1b7e5dc25 100644
--- a/configure/RULES_BUILD
+++ b/configure/RULES_BUILD
@@ -170,8 +170,9 @@ ifdef RES
 	@$(RM) *$(RES)
 endif
 
-$(DIRECTORY_TARGETS) :
-	$(MKDIR) -p $@
+# Sort mkdir targets to remove duplicates & make parents first
+$(DIRECTORY_TARGETS):
+	$(MKDIR) $(sort $@)
 
 # Install LIB_INSTALLS libraries before linking executables
 $(TESTPRODNAME) $(PRODNAME): | $(INSTALL_LIB_INSTALLS)