diff --git a/graphics/dcmtk/Makefile b/graphics/dcmtk/Makefile
index f1e606b9bec1..eb97a85aed4e 100644
--- a/graphics/dcmtk/Makefile
+++ b/graphics/dcmtk/Makefile
@@ -32,4 +32,13 @@ PORTDOCS=	*
 
 TEST_TARGET=	test test-exhaustive
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+.if ${ARCH:Mpowerpc*} && ${COMPILER_VERSION} == 140
+LLVM_VER=	15
+BUILD_DEPENDS+=	clang${LLVM_VER}:devel/llvm${LLVM_VER}
+CC=		${LOCALBASE}/bin/clang${LLVM_VER}
+CXX=		${LOCALBASE}/bin/clang++${LLVM_VER}
+.endif
+
+.include <bsd.port.post.mk>