Oh, sorry. I may have chosen a bad email subject.

This failed scratch build shows what was happening:
https://koji.fedoraproject.org/koji/taskinfo?taskID=2468876

On Wed, Sep 15, 2010 at 11:07 PM, Robin Lee <robinlee.sysu@gmail.com> wrote:
The main issue is failing to use a macro defined with %__python3 to specify the version of a requirement.

The recipe is sth like this:

%global py3_ver %(echo `%{__python3} -c "import sys;
sys.stdout.write(sys.version[:3])"`)

.......


Requires: python(abi) = %{py3_ver}

On Wed, Sep 15, 2010 at 10:32 PM, David Malcolm <dmalcolm@redhat.com> wrote:
I suspect I haven't had enough coffee yet, but I don't see the problem
here.  Why not simply add "python3-devel" as a build requirement as
Ignacio says?

If a build requirement isn't installed, it's acceptable for a build to
fail: it's a violation of a precondition.

On Wed, 2010-09-15 at 19:35 +0800, Robin Lee wrote:
> You should build this package in a clean root like a mock environment.
> If you have python3-devel already installed and then run rpmbuild
> --rebuild, you will not see the issue.
>
> On Wed, Sep 15, 2010 at 7:25 PM, Robin Lee <robinlee.sysu@gmail.com>
> wrote:
>         For a more concrete example:
>         https://bugzilla.redhat.com/show_bug.cgi?id=567348
>         I want to set the python(abi) requirement of the subpackage at
>         buildtime. So, I want to set it like this:
>         Requires: python(abi) = %{py3_ver}
>
>         But when build it, it will fail with the following output:
>         $ rpmbuild -bp dreampie.spec
>         Building target platforms: i686
>         Building for target i686
>         sh: python3: command not found
>         sh: python3: command not found
>         sh: python3: command not found
>         error: line 46: Version required: Requires:   python(abi) =
>
>         Even though python3-devel has been added as BR.
>
>
>
>         On Wed, Sep 15, 2010 at 7:06 PM, Ignacio Vazquez-Abrams
>         <ivazqueznet@gmail.com> wrote:
>
>                 On Wed, 2010-09-15 at 18:22 +0800, Robin Lee wrote:
>                 > python3 rpm macros not available without
>                 python3-devel installed.
>                 > 'rpmbuild --viewrc' will show you.
>                 >
>                 > So if you use the python3 macros to define another
>                 macro and you have
>                 > no python3-devel installed, you must fail.
>                 >
>                 > So, how to define, for example, a %py3_ver macro for
>                 the major version
>                 > of Python3? Must yum be used?
>                 >
>                 > Robin
>
>
>                 Adding a "BuildRequires: python3-devel" should be
>                 enough to pull them
>                 in.
>
>                 --
>                 Ignacio Vazquez-Abrams <ivazqueznet@gmail.com>



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