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-rw-r--r--win/rules-ext.vc2
1 files changed, 1 insertions, 1 deletions
diff --git a/win/rules-ext.vc b/win/rules-ext.vc
index 58c70fa..531e070 100644
--- a/win/rules-ext.vc
+++ b/win/rules-ext.vc
@@ -35,7 +35,7 @@ macro to the name of the project makefile.
!endif
# First locate the Tcl directory that we are working with.
-!ifdef TCLDIR
+!if "$(TCLDIR)" != ""
_RULESDIR = $(TCLDIR:/=\)