Comment 3 for bug 263122

For osgcal I have search in the build log and found this error:
"(EE) AIGLX error: dlopen of /usr/lib/dri/swrast_dri.so failed (/usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory)"
I have also found that this file is provided by the libgl1-mesa-dri package.

Trying both depends and rdepends on apt-cache I have found (among with the help of ~d.filoni) the possible cause of the problem:
# apt-cache depends libgl1-mesa-glx
libgl1-mesa-glx
  <...>
  Conflicts: libgl1-mesa-dri
  Replaces: <libgl1>
    libgl1-mesa-glx
    libgl1-mesa-swx11
  Replaces: libgl1-mesa-dri

So I have tried adding the libgl1-mesa-dri package as build-dep in debian/control and the package was successfully built on my PPA:
https://launchpad.net/~volans/+archive/+build/704939

I attach here the debdiff