1 files changed, 2 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 01022885..c0a174a5 100644
--- a/Makefile
+++ b/Makefile
@@ -347,7 +347,8 @@ install_dirs:
 	@ OK=true && \
 	  { [ -n "$(TARGET_DIR)" ] || { echo "Please set TARGET_DIR."; OK=false; }; } && \
 	  { [ -n "$(SBIN_DIR)" ] || { echo "Please set SBIN_DIR."; OK=false; }; } && \
-	  { [ -n "$(MAN_DIR)" ] || { echo "Please set MAN_DIR."; OK=false; }; } && $$OK
+	  { [ -n "$(MAN_DIR)" ] || { echo "Please set MAN_DIR."; OK=false; }; } && \
+	  { [ -n "$(DOC_INSTALL_DIR)" ] || { echo "Please set DOC_INSTALL_DIR."; OK=false; }; } && $$OK
 
 	mkdir -p $(TARGET_DIR)/sbin
 	mkdir -p $(SBIN_DIR)