Re: Problem building a version update of rng-tools

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

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