[root@okk dpdk]# rm -rf x86_64-native-linuxapp-gcc/ [root@okk dpdk]# A=`date +%s` ; B=`expr $A + 1`; echo $A ;date -s @"$B" 1488945198 Wed Mar 8 11:53:19 CST 2017 [root@okk dpdk]# make config T=$RTE_TARGET O=$RTE_TARGET make[3]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.config' has modification time 0.74 s in the future make[4]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.66 s in the future make[5]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.config' has modification time 0.5 s in the future make[5]: warning: Clock skew detected. Your build may be incomplete. make[5]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.41 s in the future make[6]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.config' has modification time 0.24 s in the future make[6]: warning: Clock skew detected. Your build may be incomplete. make[6]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.15 s in the future make[6]: warning: Clock skew detected. Your build may be incomplete. make[5]: warning: Clock skew detected. Your build may be incomplete. make[4]: warning: Clock skew detected. Your build may be incomplete. make[4]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.65 s in the future make[5]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.51 s in the future make[5]: warning: Clock skew detected. Your build may be incomplete. make[5]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.66 s in the future make[5]: warning: Clock skew detected. Your build may be incomplete. make[4]: warning: Clock skew detected. Your build may be incomplete. make[4]: Warning: File `/root/src/thirdparty/dpdk/dpdk-16.04/x86_64-native-linuxapp-gcc/.depdirs' has modification time 0.66 s in the future make[4]: warning: Clock skew detected. Your build may be incomplete. make[3]: warning: Clock skew detected. Your build may be incomplete. Configuration done [root@okk dpdk]# A=`date +%s` ; B=`expr $A + 1`; echo $A ;date -s @"$B" 1488945220 Wed Mar 8 11:53:41 CST 2017