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I used to have Simon J. Mudd when building postfix rpm package, but seems he’s not releasing official postfix 2.7.0 yet, here’s a way for impatient one
First make RedHat Linux the standard directory structure in our homedir
$ mkdir rpmbuild
$ mkdir -p rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS,tmp}
Create .rpmmacros file
$ vi .rpmmacros
%_topdir %(echo $HOME)/rpmbuild %_tmppath %(echo $HOME)/rpmbuild/tmp
Create tempoerary working directory for postfix
$ mkdir postfix $ cd postfix
Even there’s an easier way calculating directory size ftw syscall/API
NAME ftw, nftw - file tree walk DESCRIPTION ftw() walks through the directory tree that is located under the directory dirpath, and calls fn() once for each entry in the tree. By default, directories are handled before the files and subdirectories they contain (pre-order traversal). CONFORMING TO POSIX.1-2001, SVr4, SUSv1.
example code size.c