If installed, it is used automatically, which fails under PORTS_PRIVSEP=Yes.

They have a knob to disable detection;  our USE_CCACHE=yes keeps working.

OK?

Index: Makefile
===================================================================
RCS file: /cvs/ports/x11/contour/Makefile,v
diff -u -p -r1.1.1.1 Makefile
--- Makefile	9 Feb 2026 14:29:25 -0000	1.1.1.1
+++ Makefile	3 Sep 2026 19:54:09 -0000
@@ -46,6 +46,7 @@ RUN_DEPENDS =		devel/desktop-file-utils 
 			multimedia/gstreamer1/plugins-good
 
 CONFIGURE_ARGS =	-DQt5_DIR=${LOCALBASE}/lib/qt5/cmake/Qt5 \
+			-DCCACHE=OFF \
 			-DCONTOUR_QT_VERSION=5
 
 .include <bsd.port.mk>