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-rw-r--r--qtcreatorplugin.pri4
1 files changed, 2 insertions, 2 deletions
diff --git a/qtcreatorplugin.pri b/qtcreatorplugin.pri
index 6579467a0d7..190dbed1c3b 100644
--- a/qtcreatorplugin.pri
+++ b/qtcreatorplugin.pri
@@ -1,5 +1,5 @@
-IDE_SOURCE_TREE=$$(QTC_SOURCE)
-IDE_BUILD_TREE=$$(QTC_BUILD)
+isEmpty(IDE_SOURCE_TREE): IDE_SOURCE_TREE=$$(QTC_SOURCE)
+isEmpty(IDE_BUILD_TREE): IDE_BUILD_TREE=$$(QTC_BUILD)
isEmpty(IDE_SOURCE_TREE):error(Set QTC_SOURCE environment variable)
isEmpty(IDE_BUILD_TREE):error(Set QTC_BUILD environment variable)