Problem with MATLAB mex files with Ubuntu 11.04

[cparmer]

I updated the mexopts.sh file, and I was able to compile my file. However, I'm still getting an error with the .mexa64 file:

??? Invalid MEX-file '/home/cparmer/VarietyPack/Programming/Lessons/Mex/
.mexa64':

/home/cparmer/MATLAB/R2011a/bin/glnxa64/../../sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.11' not found (required by
/home/cparmer/VarietyPack/Programming/Lessons/Mex/import_matrix.mexa64)

ideas?

[mohammadul]

$ cd matlab/sys/os/glnx86

$ sudo mv libgcc_s.so.1 libgcc_s.so.1.back
$ sudo ln -s /lib/libgcc_s.so.1 libgcc_s.so.1
$ sudo rm libstdc++.so.6 (this was already a symbolic link)
$ sudo ln -s /usr/lib/libstdc++.so.6.0.9 libstdc++.so.6

version numbers may differ

[nguyentp]

Hello,
I have a similar problem with mex in ubuntu 11.4, Matlab 2009a. I have changed mexopts.sh file, and replaced g++ by g++-4.2, gcc by gcc-4.2. The warning about gcc compiler doesn't appear, but there is still error message as follows when I tried to compiled:
>> make
DT.c:27:1: warning: "INFINITY" redefined
In file included from /usr/include/math.h:40,
from DT.c:24:
/usr/include/bits/inf.h:27:1: warning: this is the location of the previous definition
/usr/bin/ld: cannot find -lgcc_s
collect2: ld returned 1 exit status

mex: link of ' "DT.mexglx"' failed.

Any one can show me how to fix this error? Thanks.

[trendymoniker]

mohammadul, your solution works.