Don't use <(DEPTH) in the argument to the -include flag.

nss.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       ['OS=="ios"', {
         'exclude_nss_root_certs%': 0,
         'exclude_nss_libpkix%': 0,
@@ skipping 522 matching lines @@
         'nss/lib/dev/nssdevt.h',
         'nss/lib/freebl/aeskeywrap.c',
         'nss/lib/freebl/alg2268.c',
         'nss/lib/freebl/alghmac.c',
         'nss/lib/freebl/alghmac.h',
         'nss/lib/freebl/arcfive.c',
         'nss/lib/freebl/arcfour.c',
         'nss/lib/freebl/blapi.h',
         'nss/lib/freebl/blapii.h',
         'nss/lib/freebl/blapit.h',
-        'nss/lib/freebl/build_config_mac.h',
         'nss/lib/freebl/camellia.c',
         'nss/lib/freebl/camellia.h',
         'nss/lib/freebl/chacha20/chacha20.c',
         'nss/lib/freebl/chacha20/chacha20.h',
         'nss/lib/freebl/chacha20/chacha20_vec.c',
         'nss/lib/freebl/chacha20poly1305.c',
         'nss/lib/freebl/chacha20poly1305.h',
         'nss/lib/freebl/ctr.c',
         'nss/lib/freebl/ctr.h',
         'nss/lib/freebl/cts.c',
@@ skipping 52 matching lines @@
         'nss/lib/freebl/mpi/mpi_x86_asm.c',
         'nss/lib/freebl/mpi/mplogic.c',
         'nss/lib/freebl/mpi/mplogic.h',
         'nss/lib/freebl/mpi/mpmontg.c',
         'nss/lib/freebl/mpi/mpprime.c',
         'nss/lib/freebl/mpi/mpprime.h',
         'nss/lib/freebl/mpi/mp_gf2m-priv.h',
         'nss/lib/freebl/mpi/mp_gf2m.c',
         'nss/lib/freebl/mpi/mp_gf2m.h',
         'nss/lib/freebl/mpi/primes.c',
+        'nss/lib/freebl/nss_build_config_mac.h',
         'nss/lib/freebl/poly1305/poly1305-donna-x64-sse2-incremental-source.c',
         'nss/lib/freebl/poly1305/poly1305.c',
         'nss/lib/freebl/poly1305/poly1305.h',
         'nss/lib/freebl/pqg.c',
         'nss/lib/freebl/pqg.h',
         'nss/lib/freebl/rawhash.c',
         'nss/lib/freebl/rijndael.c',
         'nss/lib/freebl/rijndael.h',
         'nss/lib/freebl/rijndael32.tab',
         'nss/lib/freebl/rsa.c',
@@ skipping 493 matching lines @@
             'HAVE_STRERROR',
             'HAVE_BSD_FLOCK',
             'SHLIB_SUFFIX=\"dylib\"',
             'SHLIB_PREFIX=\"lib\"',
             'SOFTOKEN_LIB_NAME=\"libsoftokn3.dylib\"',
           ],
           'sources!': [
             'nss/lib/freebl/mpi/mpi_amd64.c',
           ],
           'variables': {
-            'forced_include_file': '<(DEPTH)/third_party/nss/nss/lib/freebl/build_config_mac.h',
+            'forced_include_file': 'nss_build_config_mac.h',
           },
           'xcode_settings': {
             'conditions': [
               ['component == "shared_library"', {
                 'GCC_SYMBOLS_PRIVATE_EXTERN': 'NO',  # no -fvisibility=hidden
               }],
             ],
             # Define processor architecture specific macros in
             # <(forced_include_file).
             'OTHER_CFLAGS': [
@@ skipping 92 matching lines @@
             '-Wno-incompatible-pointer-types',
             '-Wno-logical-op-parentheses',
             '-Wno-switch',
             '-Wno-tautological-compare',
           ],
         }],
       ],
     },
   ],
 }