From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: GFortran =?utf-8?Q?can=E2=80=99t?= find system headers
Date: Tue, 15 Oct 2013 22:17:53 +0200
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References: <87wqlfutme.fsf@karetnikov.org>
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In-Reply-To: <87wqlfutme.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Tue, 15 Oct 2013 06:59:21 +0400")
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: guix-devel@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> I=E2=80=99m trying to package APL, which requires LAPACK, which requires
> Fortran.

Cool.

> Here=E2=80=99s my attempt to add the last one:
>
> (define-public gfortran-4.8
>   (package (inherit gcc-4.8)
>     (name "gfortran")
>     (arguments `(#:configure-flags '("--enable-languages=3Dfortran")))))
>
> I get the following error while trying to build it:
>
> The directory that should contain system headers does not exist:
>   /usr/include

Yes, the problem is that the your =E2=80=98arguments=E2=80=99 field above c=
ompletely
overrides that of =E2=80=98gcc-4.8=E2=80=99.

Instead, what should do is preserve the arguments; the value associated
with #:configure-flags should be changed to replace any
--enable-languages=3D.* flag with yours.  See =E2=80=98gcc-boot0=E2=80=99 i=
n base.scm for
how to do that.

Alternately, you could turn the current =E2=80=98gcc-4.8=E2=80=99 definitio=
n into a
=E2=80=98make-gcc-4.8=E2=80=99 procedure like this:

  (define* (make-gcc-4.8 #:key languages)
    (package
       ...

       #:configure-flags ... ,(string-join languages ",")

       ...))

  (define gcc-4.8
    (make-gcc-4.8 #:languages '("c" "c++")))

That would probably be easier to work with.

HTH,
Ludo=E2=80=99.