diff -ruN splix.orig/rules.mk splix/rules.mk
--- splix.orig/rules.mk	2020-11-17 15:29:33.504520423 +0100
+++ splix/rules.mk	2020-11-17 15:30:12.081410829 +0100
@@ -6,12 +6,12 @@
 
 $(rastertoqpdl_TARGET): $(rastertoqpdl_OBJ)
 	$(call printCmd, $(cmd_link))
-	$(Q)g++ -o $@ $^ $(rastertoqpdl_CXXFLAGS) $(rastertoqpdl_LDFLAGS) $(LDFLAGS) \
+	$(Q)$(CXX) -o $@ $^ $(rastertoqpdl_CXXFLAGS) $(rastertoqpdl_LDFLAGS) $(LDFLAGS) \
 		$(rastertoqpdl_LIBS)
 
 $(pstoqpdl_TARGET): $(pstoqpdl_OBJ)
 	$(call printCmd, $(cmd_link))
-	$(Q)g++ -o $@ $^ $(pstoqpdl_CXXFLAGS) $(pstoqpdl_LDFLAGS) $(LDFLAGS) \
+	$(Q)$(CXX) -o $@ $^ $(pstoqpdl_CXXFLAGS) $(pstoqpdl_LDFLAGS) $(LDFLAGS) \
 		$(pstoqpdl_LIBS)
 
 .PHONY: install installcms