yum - list configure flags/options used to compile package

Question

How can I see a list of flags/options used to configure and compile a certain package in yum, without having to install it first? Say apache, for example.

$ yum list available httpd
    Available Packages
    httpd.x86_64           2.2.15-15.el6.centos.1          base

I'm running CentOS 6.3.

UPDATE

I followed @jsbillings answer, but first I had to add the CentOS Source repository, as it doesn't seem to be included by default.

Added the following to /etc/yum.repos.d/CentOS-Base.repo

[base-source]
name=CentOS-$releasever - Base - Source
baseurl=http://vault.centos.org/6.3/os/Source

Answer 1

You'll have to grab the package's source RPM. For example, with apache httpd:

yumdownloader --source httpd

You can extract just the spec file from the source rpm with:

rpm2cpio httpd-version.src.rpm | cpio -i httpd.spec

Then, search for the %build section in the RPM spec file.

Sadly, CentOS doesn't appear to keep their spec files in any kind of public repository that I can find on their web site. You'll have to use the above steps to determine how the package is built.

Answer 2

I think the place to look is the src package, at the spec file should be a section where the configure command is specified. But I don't know if you could do it without installing it.