+AM_CONDITIONAL([BUILD_LINUX],[test "x$x$ac_system" = "xLinux"])
+AM_CONDITIONAL([BUILD_SOLARIS],[test "x$x$ac_system" = "xSolaris"])
+AM_CONDITIONAL([BUILD_DARWIN],[test "x$x$ac_system" = "xDarwin"])
+AM_CONDITIONAL([BUILD_OPENBSD],[test "x$x$ac_system" = "xOpenBSD"])
+AM_CONDITIONAL([BUILD_AIX],[test "x$x$ac_system" = "xAIX"])
+AM_CONDITIONAL([BUILD_FREEBSD],[test "x$x$ac_system" = "xFreeBSD"])
+