conda/conda-build — pull request #19 by peter1000 (2014-01-23 19:28:18+00:00)
Title: * add ability to install into a separate clean installdir instead of _build PREFIX

* add ability to install into a separate clean installdir instead of
_build PREFIX where all the build required files are located.

as mentioned some times ago if one compile a package which requires itself (e.g. make, gcc, glibc, ect..) one ends up with an empty r nearly empty final conda package with only the info folder.

This is also understandable as files are only selected on a diff from the _build PREFIX folder.

In my opinion there are 3 options:
- leave it as it is and say that packages like make, gcc, glibc ect are not really the focus
- a better solution but not really fine: do a diff with time stamp check: so if a file gets installed into PREFIX it can still be included in the final conda pkg
- use a separate install folder: which I propose as a subfolder of PREFIX

e.g. usage:
```
./configure --prefix=${INSTALLDIR}
make
make install
```
or:
```
/configure --prefix=whatever
make
make DESTDIR=${INSTALLDIR} install
```

e.g. usage for python apps:
```
$PYTHON setup.py install --prefix=./ --root=${INSTALLDIR} || exit 1
```