Expose generated environment.

Other tools will have possiblity to read runtime, separated, environment of
SlapOS node.

This is following the idea of providing isolation from operating system
environment.

component/slapos/buildout.cfg

 [buildout]
 extends =
   ../../stack/shacache-client.cfg
-  ../m2crypto/buildout.cfg
+  ../bison/buildout.cfg
+  ../bzip2/buildout.cfg
+  ../gdbm/buildout.cfg
+  ../gettext/buildout.cfg
+  ../glib/buildout.cfg
+  ../libxml2/buildout.cfg
+  ../libxslt/buildout.cfg
   ../lxml-python/buildout.cfg
+  ../m2crypto/buildout.cfg
+  ../m4/buildout.cfg
+  ../ncurses/buildout.cfg
+  ../openssl/buildout.cfg
+  ../pkgconfig/buildout.cfg
+  ../popt/buildout.cfg
   ../python-2.7/buildout.cfg
+  ../readline/buildout.cfg
+  ../sqlite3/buildout.cfg
+  ../swig/buildout.cfg
+  ../zlib/buildout.cfg
 
 parts =
   slapos
+  environment
 
 find-links =
   http://www.nexedi.org/static/packages/source/slapos.buildout/
@@ -27,6 +44,26 @@ include-site-packages = false
 exec-sitecustomize = false
 allowed-eggs-from-site-packages =
 
+[environment]
+# Section exposes SlapOS default environment.
+# Note: For now original PATH is appeneded to the end, as not all tools are
+#       provided by SlapOS
+recipe = plone.recipe.command
+PATH=${bison:location}/bin:${bzip2:location}/bin:${gettext:location}/bin:${glib:location}/bin:${libxml2:location}/bin:${libxslt:location}/bin:${m4:location}/bin:${ncurses:location}/bin:${openssl:location}/bin:${pkgconfig:location}/bin:${python2.7:location}/bin:${readline:location}/bin:${sqlite3:location}/bin:${swig:location}/bin:${buildout:bin-directory}:$PATH
+
+CFLAGS=-I${bzip2:location}/include -I${gdbm:location}/include -I${gettext:location}/include -I${glib:location}/include -I${libxml2:location}/include -I${libxslt:location}/include -I${ncurses:location}/include -I${openssl:location}/include -I${popt:location}/include -I${readline:location}/include -I${sqlite3:location}/include -I${zlib:location}/include
+CPPFLAGS=${:CFLAGS}
+LDFLAGS=-L${bzip2:location}/lib -Wl,-rpath=${bzip2:location}/lib -L${gdbm:location}/lib -Wl,-rpath=${gdbm:location}/lib -L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib -L${glib:location}/lib -Wl,-rpath=${glib:location}/lib -L${libxml2:location}/lib -Wl,-rpath=${libxml2:location}/lib -L${libxslt:location}/lib -Wl,-rpath=${libxslt:location}/lib -L${ncurses:location}/lib -Wl,-rpath=${ncurses:location}/lib -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${popt:location}/lib -Wl,-rpath=${popt:location}/lib -L${readline:location}/lib -Wl,-rpath=${readline:location}/lib -L${sqlite3:location}/lib -Wl,-rpath=${sqlite3:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib
+PKG_CONFIG_PATH=${glib:location}/lib/pkgconfig:${libxml2:location}/lib/pkgconfig:${libxslt:location}/lib/pkgconfig:${openssl:location}/lib/pkgconfig:${popt:location}/lib/pkgconfig:${python2.7:location}/lib/pkconfig:${sqlite3:location}/lib/pkconfig
+command = echo """[environment]
+  PATH=${:PATH}
+  CFLAGS=${:CFLAGS}
+  CPPFLAGS=${:CPPFLAGS}
+  LDFLAGS=${:LDFLAGS}
+  PKG_CONFIG_PATH=${:PKG_CONFIG_PATH}
+  """ > ${buildout:directory}/environment.cfg
+update-commnad = ${:command}
+
 [lxml-python]
 python = python2.7