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 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