fix typos in doxygen detection

diff --git a/m4m/gp-documentation.m4 b/m4m/gp-documentation.m4
index b4a486a..c7af931 100644 (file)
--- a/m4m/gp-documentation.m4
+++ b/m4m/gp-documentation.m4
@@ -119,9 +119,9 @@ AC_DEFUN([GP_CHECK_DOXYGEN],[dnl
 AC_REQUIRE([GP_CHECK_DOC_DIR])dnl
 AC_PATH_PROG([DOT], [dot], [false])
 AC_PATH_PROG([DOXYGEN], [doxygen], [false])
-AM_CONDITIONAL([HAVE_DOXYGEN], [test "x$DOXYGEN" != "false"])
-AM_CONDITIONAL([HAVE_DOT], [test "x$DOT" != "false"])
-if test "x$DOT" != "false"; then
+AM_CONDITIONAL([HAVE_DOXYGEN], [test "x$DOXYGEN" != "xfalse"])
+AM_CONDITIONAL([HAVE_DOT], [test "x$DOT" != "xfalse"])
+if test "x$DOT" != "xfalse"; then
        AC_SUBST([HAVE_DOT],[YES])
 else
        AC_SUBST([HAVE_DOT],[NO])