Re: Problem building a version update of rng-tools

[Adolf Belka <adolf.belka@ipfire.org>]

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On 03/05/2023 14:35, Adolf Belka wrote:
> Hi Michael,
>
> On 03/05/2023 14:07, Michael Tremer wrote:
>> Hello Adolf,
>>
>> Normally you should not need to add anything extra for this to work. The compiler should know where to search for libraries.
>>
>> If pkg-config is being used, this might be a little bit different.
> Just before the various packages are checked to exist the configure also checks that pkg-config is existing.
>>
>>> On 3 May 2023, at 13:02, Adolf Belka <adolf.belka(a)ipfire.org> wrote:
>>>
>>> Hi All,
>>>
>>>
>>> There is a new version for rng-tools so I thought I would do an update but it kept stopping saying that it required libcap and could not find it.
>>>
>>> I noted that the libcap libs are in /lib and not in /usr/lib as the other packages that rng-tools looks for have their libs. (openssl, libxml2, curl, jansson)
>>>
>>> The new version has a flag for the ./configure called libcap_LIBS which can be used to override pkg-config.
>>>
>>> I tried that in various ways such as libcap_LIBS="/lib" or libcap_LIBS="/lib/libcap.so.2.67" and others, but none of them worked. The ./configure still ended up with the message
>>>
>>> checking for libcap... no
>>> configure: error: libcap is required
>>>
>>> I then noticed that libcap.pc is in /lib/pkgconfig/ while all the other packages being searched for are in /usr/lib/pkgconfig/
>>
>> This should indeed be installed to /usr/lib/pkgconfig.
>>
>> I don’t have a problem with simply changing —-prefix=/ to —-prefix=/usr for libcap, because we don’t support a split /usr directory anyways. That should make it easier.
Looking through the libcap README and Makefile then the .pc files should be getting placed in /usr/lib/pkgconfig but they aren't. Also as $(prefix) is not defined then the prefix should be /usr but again it is not.
> libcap currently keeps the library files in /lib/ but makes a symlink to one of them in /usr/lib/. Libcap doesn't have a configure line. There is a sed command on the Makefile to stop it building static libs and then it goes straight to make and then make install
>>
>>> I then manually did a copy of libcap.pc to /usr/lib/pkgconfig/ and then re ran just the rng-tools build and it then successfully found libcap and completed the build. So the problem is definitely to do withy the unusual location for the library files of libcap.
>>
>> Do we have any other packages that install .pc files into funny places?
> The other .pc files that are in /lib/pkgconfig/ are libkeyutils, libproc-2, libpsx and libsysfs
>>
The libpsx.pc file is also from libcap.
>>> So the question I have is what is the best way to deal with this.
>>>
>>> Should I add into the libcap lfs a line that copies the libcap.pc to /usr/lib/pkgconfig/ or
>>>
>>> is can someone tell me what I am doing wrong with the libcap_LIBS flag for ./configure
>>>
I think that rather than trying to adjust libcap to work the way it says it should be anyway, I will add a copy line into the lfs to move the libcap.pc file to /usr/lib/pkgconfig/


Regards,

Adolf.

>>>
>>> Regards,
>>>
>>> Adolf.
>>>
>>
>> -Michael