Description:
I usually want to have grep print additional information, hence I have something like "alias grep='grep -n'" in my bashrc.
If this is the case, the bash-completionfor make will print error messages like "bash: 23:set: command not found".
Having a look at /usr/share/bash-completion/completions/make:144 reveals the following problem:

The current status is obtained via "local reset=$( set +o | grep -F posix );" and afterwards restored via "$reset".
However, due to the alias, the reset variable contains "23:set +o posix".

As a fix, I propose to change this line to "local reset=$( set +o | `which grep` -F posix );"...

Additional info:
* extra/bash-completion 2.1-2

Steps to reproduce:
* Add "alias grep='grep -n'" to your bashrc
* Go into a folder with a Makefile
* Try tab completion on make (enter "make " and press tab)