diff --git a/arts-trinity.spec b/arts-trinity.spec
index 2668e28..6aa2ec5 100644
--- a/arts-trinity.spec
+++ b/arts-trinity.spec
@@ -28,6 +28,7 @@ Development libraries and headers for TQT arts.
 cd ../
 mkdir tqt.build
 cd tqt.build
+export PKG_CONFIG_PATH=%trinity_dir/lib64/pkgconfig
 cmake \
 -DQT_PREFIX_DIR=%{trinity_dir} \
 -DMOC_EXECUTABLE=%{trinity_dir}/bin/tqmoc \