--- bazel-0.3.1/tools/cpp/cc_configure.bzl	2016-10-13 14:00:32.118358387 +0200
+++ bazel-0.3.1/tools/cpp/cc_configure.bzl	2016-10-13 13:52:45.342610147 +0200
@@ -173,8 +173,23 @@
   else:
     inc_dirs = result.stderr[index1 + 1:index2].strip()
 
-  return [repository_ctx.path(_cxx_inc_convert(p))
-          for p in inc_dirs.split("\n")]
+  default_inc_directories = [
+    repository_ctx.path(_cxx_inc_convert(p))
+    for p in inc_dirs.split("\n")
+  ]
+
+  env = repository_ctx.os.environ
+  if "SPACK_DEPENDENCIES" in env:
+    for dep in env["SPACK_DEPENDENCIES"].split(":"):
+      path = dep + "/include"
+      # path = repository_ctx.os.path.join(dep, "include")
+      # if not repository_ctx.os.path.exists(path):
+      #   continue
+      default_inc_directories.append(
+        repository_ctx.path(_cxx_inc_convert(path))
+      )
+
+  return default_inc_directories
 
 def _add_option_if_supported(repository_ctx, cc, option):
   """Checks that `option` is supported by the C compiler."""