-if test x$USE_MAINTAINER_MODE = xyes
-then
- # Check for doxygen when in maintainer mode since dist* targets fail
- # without it
- AC_PATH_PROG(DOXYGEN,doxygen,`which doxygen`)
- if test x$DOXYGEN = x ; then
- AC_MSG_ERROR([doxygen is mandatory in maintainer mode])
- fi
-fi
+# Check for doxygen when in maintainer mode which is helpful to build doc & dist
+AC_PATH_PROG(DOXYGEN,doxygen,`which doxygen`)
+AM_CONDITIONAL(HAVE_DOXYGEN,test x$DOXYGEN != x)