Index: trunk/psLib/configure.ac
===================================================================
--- trunk/psLib/configure.ac	(revision 8925)
+++ trunk/psLib/configure.ac	(revision 8964)
@@ -373,7 +373,6 @@
   [AC_MSG_ERROR([The C99 function, atoll, is required; update your compiler version?])])
 
-AC_CHECK_PROG(doxygen,[doxygen],[true],[false])
-AM_CONDITIONAL(DOXYGEN, test x$doxygen = xtrue)
-
+AC_PATH_PROG([DOXYGEN], [doxygen], [missing])
+AM_CONDITIONAL([DOXYGEN], test "x$doxygen" != "xmissing")
 
 dnl ------- restore CFLAGS / LDFLAGS (tests done) --------