ns中编译的问题求教？

我在NS的编译中出现如下情况,知道的兄弟告诉我一声WHY AND HOW TO SOLVE IT ?
make[1]: Entering directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/cmu-scen-gen/setdest'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/cmu-scen-gen/setdest'
make[1]: Entering directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/dec'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/dec'
make[1]: Entering directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/epa'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/epa'
make[1]: Entering directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/nlanr'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/nlanr'
make[1]: Entering directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/ucb'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/phen/ns-allinone-2.26/ns-2.26/indep-utils/webtrace-conv/ucb'

这个是没有问题的，到ns-2.26目录下看看，有没有ns生成，不行就在这个目录下用make生成一下。

the folders you list have no problems.
If you find ns before you compile, just delete it. then run "make".
make sure that ns will be generated as you will and run a sample.
If not, copy your error msg here.