<div dir="ltr">Hi, I'm trying ti install NS2 on ubuntu 11.04 and i got the following error while executing ./install error: the error text is in my previous message I was recommended to install gcc-4.3 and use it instead of my gcc-4.5 and I did so but I still have a problem with otcl installation: ... gcc-4.3 -c -g -O2 -DNDEBUG -DUSE_SHM -fpic -I. -I/home/leila/leilans/ns-allinone-2.34/include -I/home/leila/leilans/ns-allinone-2.34/include -I/home/leila/leilans/ns-allinone-2.34/include -I/include otcl.c ld -shared -o libotcl.so otcl.o rm -f libotcl.so gcc-4.3 -o otclsh -g -O2 -I. -I/home/leila/leilans/ns-allinone-2.34/include -I/home/leila/leilans/ns-allinone-2.34/include -I/home/leila/leilans/ns-allinone-2.34/include -I/include otclAppInit.c \ -L. -lotcl -L/home/leila/leilans/ns-allinone-2.34/lib -ltk8.4 -L/home/leila/leilans/ns-allinone-2.34/lib -ltcl8.4 -lXext -lX11 -lnsl -ldl -lm /usr/bin/ld: cannot find -lgcc_s collect2: ld returned 1 exit status make: *** [otclsh] Error 1 otcl-1.13 make failed! Exiting ... See <a href="http://www.isi.edu/nsnam/ns/ns-problems.html">http://www.isi.edu/nsnam/ns/ns-problems.html</a> for problems leila@leila-HP-ProBook-4520s:~/leilans/ns-allinone-2.34$ please help thnx </div>