Dear gcc-help team, i'm not sure if the following problem is really due to installation of gcc 4.2.1, but perhaps you can help me. 1. A while ago, i did successfully build SAGE (some computer algebra system), using gcc 4.1.2. 2. Later, with your help i succeeded to build gcc 4.2.1. 3. Now, i want to build the new version of SAGE, but it didn't work, neither with gcc 4.2.1 nor 4.1.2. 4. Worse: Now even the old SAGE version does not build, neither with gcc 4.1.2 nor 4.2.1, although it did before! I get the following error message: `/usr/local/sage-2.8.5.1/spkg/build/ntl-5.4.1.p5/src/src/small/src' ./InitSettings: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.9' not found (required by ./InitSettings) objdump -T showed me that libstdc++.so.6 mentions GLIBCXX_3.4.8, but not _3.4.9. Moreover, ls -l showed me that libstdc++.so.6 did not change since June 18 --- and the successful sage built was later. So, from my amateur point of view, the conclusion is that previously only GLIBCXX_3.4.8 was expected. Do you have an idea how i might have messed these things up? I mean, what software is responsible for chosing a version of GLIBCXX? Note that a google search with "GLIBCXX_3.4.9' not found" yields a lot of hits, so it seems to be a common problem. But i did not find any web page providing a solution. Yours sincerely Simon
