The exVim only change make option when use :GMake command, so
the :make should have the same behavior no matter you install exVim or
not.
The only problem I doubt should let you don't get your error.err, is
because exVim force to set the current-work-directory to the directory
that you open the vimentry file. So you can find if the error.err is
output in the vimentry file directory.
By the way, you can use
:set makeef
to check if your default output error file still be "error.err"
Here is the description of makeef option I found in vim, may be this
can help you to locate the problem
'makeef'	Errorfile to be used for ":make".  "##" is replaced with a
		unique number.  Avoids that two Vim sessions overwrite each
		others errorfile.  The Unix default is "/tmp/vim##.err"; for
		Amiga "t:vim##.Err, for others "vim##.err".
Any progress let me know :)
On Oct 3, 7:40 pm, Nathan Huesken <
nathan.hues...@googlemail.com>