shared cmmi TODO: pkgconfig built twice

We build pkg-config twice, so maybe we should install twice in two
different locations ? ( I'm not sure of the exact reasons for compiling
twice, so I'm still not sure if this is a good idea )

component/pkgconfig/buildout.cfg

@@ -13,13 +13,14 @@ extends =
 
 [pkgconfig]
 recipe = slapos.recipe.cmmi
+shared = true
 url = https://pkgconfig.freedesktop.org/releases/pkg-config-0.29.tar.gz
 md5sum = 77f27dce7ef88d0634d0d6f90e03a77f
-location = ${buildout:parts-directory}/${:_buildout_section_name_}
 # build pkg-config twice so that second configure can use pkg-config
 # to compute GLIB_CFLAGS and GLIB_LIBS.
+# XXX - why not make 2 parts ? - jerome
 pre-configure =
-  ./configure --prefix=${:location} --with-installed-glib && make
+  ./configure --prefix=@@LOCATION@@ --with-installed-glib && make
 configure-options =
   --with-installed-glib
   --disable-host-tool