Why does installing DBD::Pg fail in DynaLoader?

Error:  Can't load '/home/oracle/.cpan/build/DBD-Pg-2.16.1/blib/开发者_如何学Pythonarch/auto/DBD/Pg/Pg.so' for module DBD::Pg: libpq.so.5: cannot open shared object file: No such file or directory at /usr/lib/perl5/5.8.8/i386-linux-thread-multi/DynaLoader.pm line 230.

Did anyone have similar error while instaling DBD::Pg perl module ? what can I do to fix it ?

You should go under perl to solve these dynamic linking problems. Use strace program &> out, and then grep for libpq.so.5. My guess is your libpq.so.5 is in the wrong location, or your DynaLoader is misconfigured. Read the docs on @dl_library_path.

You can see what your search path is with this (the strace will also show it trying to find the .so by checking each directory):

perl -MDynaLoader -le'print for @DynaLoader::dl_library_path;'

Make sure your libpq.5.so falls in one of those. The strace will also show if the kernel is returning an error to DynaLoader that it is cloaking; moreover, it will certainly tell you everything DynaLoader knows.

The libpq.so.5 file is missing, which indicates that you do not have the Postgresql client library installed. On Ubuntu this file is provided by the libpq5 package.

Make sure the path to the PostgreSQL library is in either ld.so.conf or in a file in ld.so.conf.d and re-run "sudo ldconf" (or sudo /sbin/ldconf). That's taken care of this issue when I've encountered it in the past.

I know lots of people have answered your question but I thought I'd add one more thing. Makefile.PL locates the postgres libraries by executing pg_config. If this can't be found on your path, then you will find this sort of error. Interestingly though, it looks for the headers in the same way. Try running pg_config from your terminal and see what the output is. If it's not found in your path, locate it, add to your path and try to build DBD::Pg again