Hello, I there any consideration about the following crash. I am using Scientific Linux 6.3. I have stuck at this point because I am not able to use fstream. #include <fstream> using namespace std; int main() { ofstream fout ("test.txt", fstream::out); return 0; } [mahmood@localhost ~]$ /opt/gcc-4.1.2-built/bin/g++ -g -ggdb -o test test.cpp [mahmood@localhost ~]$ gdb test GNU gdb (GDB) Red Hat Enterprise Linux (7.2-56.el6) Copyright (C) 2010 Free Software Foundation, Inc. ... Reading symbols from /home/mahmood/test...done. (gdb) r Starting program: /home/mahmood/test Program received signal SIGSEGV, Segmentation fault. 0x00000037e26f22d0 in ?? () from /usr/lib64/libstdc++.so.6 Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.80.el6_3.5.x86_64 libgcc-4.4.6-4.el6.x86_64 libstdc++-4.4.6-4.el6.x86_64 (gdb) bt #0 0x00000037e26f22d0 in ?? () from /usr/lib64/libstdc++.so.6 #1 0x0000000000000000 in ?? () (gdb) Regards, Mahmood