diff --git a/npa/configure.ac b/npa/configure.ac
index 4dc68e2..3ac7133 100644
--- a/npa/configure.ac
+++ b/npa/configure.ac
@@ -29,6 +29,7 @@ AM_PROG_CC_C_O
 PKG_PROG_PKG_CONFIG
 AC_PATH_PROG(HELP2MAN, help2man, false // No help2man //)
 AC_PATH_PROG(GENGETOPT, gengetopt, false // No gengetopt //)
+AC_PATH_PROG(GENGETOPT, doxygen, false // No gengetopt //)
 
 # If you need to see the details, just run make V=1.
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
diff --git a/npa/doc/Makefile.am b/npa/doc/Makefile.am
index fc1c31d..60a2bd7 100644
--- a/npa/doc/Makefile.am
+++ b/npa/doc/Makefile.am
@@ -1,5 +1,3 @@
-DOXYGEN ?= doxygen
-
 do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \