+if test -z "$SOCAT" -a -n "$check_socat_escape"
+then
+AC_CACHE_CHECK([for socat with the escape feature], [ac_cv_path_SOCAT],
+ [AC_PATH_PROGS_FEATURE_CHECK(SOCAT, [socat],
+ [[$ac_path_SOCAT -hh | grep -q escape \
+ && ac_cv_path_SOCAT=$ac_path_SOCAT \
+ SOCAT=$ac_cv_path_SOCAT \
+ with_socat_escape=yes ac_path_SOCAT_found=:]],
+ [AC_MSG_WARN([no escape feature found])])])
+fi
+
+if test -z "$SOCAT"
+then
+AC_CACHE_CHECK([for socat], [ac_cv_path_SOCAT],
+ [AC_PATH_PROGS_FEATURE_CHECK(SOCAT, [socat],
+ [[ac_cv_path_SOCAT=$ac_path_SOCAT \
+ SOCAT=$ac_cv_path_SOCAT ac_path_SOCAT_found=:]],
+ [AC_MSG_ERROR([socat not found])])])
+fi
+
+AC_SUBST([SOCAT_PATH], [$SOCAT])
+if test "x$with_socat_escape" = xyes
+then
+ AC_SUBST([SOCAT_ESCAPE], [1])
+fi
+