Linux – ld path update in centos

The library libl.a is classically the support library for AT&T Lex - it provides a dummy version of yywrap() and main(), and some other support functions. If you are using Flex, then I don't think any library is needed - the code is self-contained (as long as you provide your own version of yywrap; if you don't, use -lfl). So, you probably just need to arrange to remove the '-ll' from the command line.

If that is too hard, then create yourself a file garbage.c containing:

int podunk = 0;

Compile it to garbage.o and create a dummy libl.a:

gcc -c garbage.c
ar r libl.a garbage.o

The linker should pick up this dummy library, find nothing of relevance in it, and continue its merry way onwards.

It's not a good idea to edit /etc/profile for things like this, because you'll lose all your changes whenever CentOS publishes an update for this file. This is exactly what /etc/profile.d is for:

echo 'pathmunge /usr/lib/ruby-enterprise/bin' > /etc/profile.d/ree.sh
chmod +x /etc/profile.d/ree.sh

Log back in and enjoy your (safely) updated $PATH:

echo $PATH
/usr/lib/ruby-enterprise/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

which ruby
/usr/lib/ruby-enterprise/bin/ruby

Instead of logging back in, you could reload the profile:

. /etc/profile

This will update the $PATH variable.