gitlab: add missing dependency to pkgconfig environment for build git-backup

software/gitlab/software.cfg

@@ -12,6 +12,7 @@ extends =
     ../../component/nodejs/buildout.cfg
     ../../component/openssl/buildout.cfg
     ../../component/nginx/buildout.cfg
+    ../../component/zlib/buildout.cfg
 
 #   for instance
     ../../component/coreutils/buildout.cfg
@@ -203,6 +204,7 @@ make-targets= cd ${git2go-repository:location}
               && go install ${git-backup-repository:go.importpath}
               && cp -a ${git-backup-repository:location}/contrib/gitlab-backup ${gopath:bin}
 environment =
+  PKG_CONFIG_PATH=${openssl:location}/lib/pkgconfig:${zlib:location}/lib/pkgconfig
   PATH=${cmake:location}/bin:${pkgconfig:location}/bin:${git:location}/bin:${golang16:location}/bin:${buildout:bin-directory}:%(PATH)s
   GOPATH=${gopath:directory}