dpkg-buildpackage error when patching postfix

[Jamie McDonald]

Hello all,

I've been lurking on the list for a while but this is my first official post
of desperation =).

I'm attempting to apply the VDA quota patch to postfix-2.5.1 but it's
failing at the dpkg-buildpackage stage.

I have sucessfully patched the source as follows

bash# cd /usr/src/
bash# apt-get build-dep postfix
bash# apt-get source postfix
bash# wget http://vda.sourceforge.net/VDA/postfix-2.6.5-vda-ng.patch.gz
bash# gunzip postfix-2.5.1-vda-ng.patch.gz
bash# cd postfix-2.5.1
bash# patch -p1 < ../postfix-2.5.1-vda-ng.patch

I then execute dpkg-buildpackage in the /usr/src/postfix-2.5.1/ directory

bash# dpkg-buildpackage

However the output is as follows

dpkg-buildpackage: set CPPFLAGS to default value:
dpkg-buildpackage: set CFLAGS to default value: -g -O2
dpkg-buildpackage: set CXXFLAGS to default value: -g -O2
dpkg-buildpackage: set FFLAGS to default value: -g -O2
dpkg-buildpackage: set LDFLAGS to default value: -Wl,-Bsymbolic-functions
tail: cannot open `debian/changelog' for reading: No such file or directory
dpkg-buildpackage: failure: tail of debian/changelog gave error exit status
1

I've searched hi and low but as of yet have been unsuccessful in resolving
the issue. I would imagine it is something simple I'm missing - as is
usually the case.

Thanks in advance for any response.
- Jamie Mack.
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