after I update my ubuntu system to 11.04 I got some strange errors.
Under 10.04 I compiled 4.5.3 and 4.6.0 without any problems and both versions work as expected.
After update to ubuntu 11.04 I got always errors while linking with these compilers:
krud@mauersegler:~/test/c++/compile_ubuntu_11.04$ /opt/_linux-gnu_4.5.3/bin/g++ main.cpp
/opt/_linux-gnu_4.5.3/bin/../lib/gcc/i686-pc-linux-gnu/4.5.3/../../../../i686-pc-linux-gnu/bin/ld: cannot find -lm
/opt/_linux-gnu_4.5.3/bin/../lib/gcc/i686-pc-linux-gnu/4.5.3/../../../../i686-pc-linux-gnu/bin/ld: cannot find -lc
collect2: ld returned 1 exit status