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Please, I am have been having problems installing NS2 and BonnMotion. I am running openSUSE Tumbleweed (20160812) (x86_64) and I keep running into the g++c++ error: CXX=g++-6.1: No such file or directory make: *** [Makefile:103: libotcl.so] Error 1 otcl-1.14 make failed! Exiting ...(after editing the makefile.in)I have tried reading a lot about it on line and noted that its a compatibility problem but my challenge is, I cant remove the latest version without having issues and how do I install an older version that can allow the ns-allinone-2.35 version? Thank you.