+cat >configure.ac <<EOF
+[m4@&t@_include([$builddir/gob2.m4])]
+[m4@&t@_pattern_forbid([^GOB2_])]
+[m4@&t@_pattern_forbid([^DX_])]
+[AC_INIT([gob2_check], [0])]
+[GOB2_CHECK(]m4_dquote(m4_defn([MYVER]))[)]
+GOB2=\`command -v \$GOB2\`
+[AC_CONFIG_FILES([test])]
+[AC_OUTPUT]
+EOF
+AT_CHECK([$AUTOCONF --force])
+AT_CHECK([./configure], [0], [ignore])
+
+command -v gob2 >expout
+AT_CHECK([cat test], [0], [expout], [ignore])
+
+sed '/GOB2_CHECK/c\
+[GOB2_CHECK(]m4_dquote(m4_defn([MYVER_P1]))[)]' configure.ac >configure.new
+mv -f configure.new configure.ac
+AT_CHECK([$AUTOCONF --force])
+AT_CHECK([./configure], [1], [ignore], [ignore])