diff --git a/make/doxygen.mk b/make/doxygen.mk
index 9dcbea8d..2f91fdce 100644
--- a/make/doxygen.mk
+++ b/make/doxygen.mk
@@ -15,6 +15,7 @@ UNTEMPLATED                  = $(patsubst %.tmpl,%,$(wildcard *.tmpl))
 OUTPUT_DIR                  ?= html
 INSTALL_DOXYGEN_DIR         ?= $(DOC_PREFIX)/devel
 DOC_FILES                    = $(IMAGEDIR)/jannet_08.png
+DOXYGEN_CONF                ?= doxygen.conf
 
 all: html
 install: install.done
@@ -35,7 +36,7 @@ html: doxygen.done cpfiles.done
 	> $@
 
 doxygen.done: $(UNTEMPLATED)
-	doxygen doxygen.conf
+	doxygen $(DOXYGEN_CONF)
 	touch $@
 
 cpfiles.done: doxygen.done $(DOC_FILES)