diff --git a/setup.py b/setup.py
index 89418011d6ac5460cb65ec28914063f0d6476eca..3c29fe66be3152a565011a552c72d8a0a742b041 100644
--- a/setup.py
+++ b/setup.py
@@ -1,11 +1,17 @@
 #!/usr/bin/env python
 import sys
+import os.path
 
 from setuptools import setup
 from setuptools.command.test import test as TestCommand
 
 import nacl
 
+
+def here(*paths):
+    return os.path.abspath(os.path.join(os.path.dirname(__file__), *paths))
+
+
 try:
     import nacl.nacl
 except ImportError:
@@ -14,6 +20,7 @@ except ImportError:
 else:
     # building bdist - cffi is here!
     ext_modules = [nacl.nacl.ffi.verifier.get_extension()]
+    ext_modules[0].include_dirs.append(here("libsodium/src/libsodium/include"))
 
 
 class PyTest(TestCommand):
@@ -56,6 +63,153 @@ setup(
     ext_package="nacl",
     ext_modules=ext_modules,
 
+    libraries=[
+        ("sodium", {
+            "include_dirs": [
+                here("libsodium/src/libsodium/include/sodium"),
+            ],
+            "sources": [
+                here("libsodium/src/libsodium", s) for s in [
+                    "crypto_auth/crypto_auth.c",
+                    "crypto_auth/hmacsha256/auth_hmacsha256_api.c",
+                    "crypto_auth/hmacsha256/ref/hmac_hmacsha256.c",
+                    "crypto_auth/hmacsha256/ref/verify_hmacsha256.c",
+                    "crypto_auth/hmacsha512256/auth_hmacsha512256_api.c",
+                    "crypto_auth/hmacsha512256/ref/hmac_hmacsha512256.c",
+                    "crypto_auth/hmacsha512256/ref/verify_hmacsha512256.c",
+                    "crypto_box/crypto_box.c",
+                    "crypto_box/curve25519xsalsa20poly1305/box_curve25519xsalsa20poly1305_api.c",
+                    "crypto_box/curve25519xsalsa20poly1305/ref/after_curve25519xsalsa20poly1305.c",
+                    "crypto_box/curve25519xsalsa20poly1305/ref/before_curve25519xsalsa20poly1305.c",
+                    "crypto_box/curve25519xsalsa20poly1305/ref/box_curve25519xsalsa20poly1305.c",
+                    "crypto_box/curve25519xsalsa20poly1305/ref/keypair_curve25519xsalsa20poly1305.c",
+                    "crypto_core/hsalsa20/ref2/core_hsalsa20.c",
+                    "crypto_core/hsalsa20/core_hsalsa20_api.c",
+                    "crypto_core/salsa20/ref/core_salsa20.c",
+                    "crypto_core/salsa20/core_salsa20_api.c",
+                    "crypto_core/salsa2012/ref/core_salsa2012.c",
+                    "crypto_core/salsa2012/core_salsa2012_api.c",
+                    "crypto_core/salsa208/ref/core_salsa208.c",
+                    "crypto_core/salsa208/core_salsa208_api.c",
+                    "crypto_generichash/crypto_generichash.c",
+                    "crypto_generichash/blake2/generichash_blake2_api.c",
+                    "crypto_generichash/blake2/ref/blake2b-ref.c",
+                    "crypto_generichash/blake2/ref/generichash_blake2b.c",
+                    "crypto_hash/crypto_hash.c",
+                    "crypto_hash/sha256/hash_sha256_api.c",
+                    "crypto_hash/sha256/ref/hash_sha256.c",
+                    "crypto_hash/sha512/hash_sha512_api.c",
+                    "crypto_hash/sha512/ref/hash_sha512.c",
+                    "crypto_hashblocks/sha256/ref/blocks_sha256.c",
+                    "crypto_hashblocks/sha256/hashblocks_sha256_api.c",
+                    "crypto_hashblocks/sha512/ref/blocks_sha512.c",
+                    "crypto_hashblocks/sha512/hashblocks_sha512_api.c",
+                    "crypto_onetimeauth/crypto_onetimeauth.c",
+                    "crypto_onetimeauth/poly1305/onetimeauth_poly1305.c",
+                    "crypto_onetimeauth/poly1305/onetimeauth_poly1305_api.c",
+                    "crypto_onetimeauth/poly1305/onetimeauth_poly1305_try.c",
+                    "crypto_onetimeauth/poly1305/53/auth_poly1305_53.c",
+                    "crypto_onetimeauth/poly1305/53/verify_poly1305_53.c",
+                    "crypto_onetimeauth/poly1305/donna/auth_poly1305_donna.c",
+                    "crypto_onetimeauth/poly1305/donna/verify_poly1305_donna.c",
+                    "crypto_scalarmult/crypto_scalarmult.c",
+                    "crypto_secretbox/crypto_secretbox.c",
+                    "crypto_secretbox/xsalsa20poly1305/secretbox_xsalsa20poly1305_api.c",
+                    "crypto_secretbox/xsalsa20poly1305/ref/box_xsalsa20poly1305.c",
+                    "crypto_shorthash/crypto_shorthash.c",
+                    "crypto_shorthash/siphash24/shorthash_siphash24_api.c",
+                    "crypto_shorthash/siphash24/ref/shorthash_siphash24.c",
+                    "crypto_sign/crypto_sign.c",
+                    "crypto_sign/ed25519/sign_ed25519_api.c",
+                    "crypto_sign/ed25519/ref10/fe_0.c",
+                    "crypto_sign/ed25519/ref10/fe_1.c",
+                    "crypto_sign/ed25519/ref10/fe_add.c",
+                    "crypto_sign/ed25519/ref10/fe_cmov.c",
+                    "crypto_sign/ed25519/ref10/fe_copy.c",
+                    "crypto_sign/ed25519/ref10/fe_frombytes.c",
+                    "crypto_sign/ed25519/ref10/fe_invert.c",
+                    "crypto_sign/ed25519/ref10/fe_isnegative.c",
+                    "crypto_sign/ed25519/ref10/fe_isnonzero.c",
+                    "crypto_sign/ed25519/ref10/fe_mul.c",
+                    "crypto_sign/ed25519/ref10/fe_neg.c",
+                    "crypto_sign/ed25519/ref10/fe_pow22523.c",
+                    "crypto_sign/ed25519/ref10/fe_sq.c",
+                    "crypto_sign/ed25519/ref10/fe_sq2.c",
+                    "crypto_sign/ed25519/ref10/fe_sub.c",
+                    "crypto_sign/ed25519/ref10/fe_tobytes.c",
+                    "crypto_sign/ed25519/ref10/ge_add.c",
+                    "crypto_sign/ed25519/ref10/ge_double_scalarmult.c",
+                    "crypto_sign/ed25519/ref10/ge_frombytes.c",
+                    "crypto_sign/ed25519/ref10/ge_madd.c",
+                    "crypto_sign/ed25519/ref10/ge_msub.c",
+                    "crypto_sign/ed25519/ref10/ge_p1p1_to_p2.c",
+                    "crypto_sign/ed25519/ref10/ge_p1p1_to_p3.c",
+                    "crypto_sign/ed25519/ref10/ge_p2_0.c",
+                    "crypto_sign/ed25519/ref10/ge_p2_dbl.c",
+                    "crypto_sign/ed25519/ref10/ge_p3_0.c",
+                    "crypto_sign/ed25519/ref10/ge_p3_dbl.c",
+                    "crypto_sign/ed25519/ref10/ge_p3_to_cached.c",
+                    "crypto_sign/ed25519/ref10/ge_p3_to_p2.c",
+                    "crypto_sign/ed25519/ref10/ge_p3_tobytes.c",
+                    "crypto_sign/ed25519/ref10/ge_precomp_0.c",
+                    "crypto_sign/ed25519/ref10/ge_scalarmult_base.c",
+                    "crypto_sign/ed25519/ref10/ge_sub.c",
+                    "crypto_sign/ed25519/ref10/ge_tobytes.c",
+                    "crypto_sign/ed25519/ref10/keypair.c",
+                    "crypto_sign/ed25519/ref10/open.c",
+                    "crypto_sign/ed25519/ref10/sc_muladd.c",
+                    "crypto_sign/ed25519/ref10/sc_reduce.c",
+                    "crypto_sign/ed25519/ref10/sign.c",
+                    "crypto_sign/edwards25519sha512batch/sign_edwards25519sha512batch_api.c",
+                    "crypto_sign/edwards25519sha512batch/ref/fe25519_edwards25519sha512batch.c",
+                    "crypto_sign/edwards25519sha512batch/ref/ge25519_edwards25519sha512batch.c",
+                    "crypto_sign/edwards25519sha512batch/ref/sc25519_edwards25519sha512batch.c",
+                    "crypto_sign/edwards25519sha512batch/ref/sign_edwards25519sha512batch.c",
+                    "crypto_stream/crypto_stream.c",
+                    "crypto_stream/aes128ctr/portable/afternm_aes128ctr.c",
+                    "crypto_stream/aes128ctr/stream_aes128ctr_api.c",
+                    "crypto_stream/aes128ctr/portable/beforenm_aes128ctr.c",
+                    "crypto_stream/aes128ctr/portable/common_aes128ctr.c",
+                    "crypto_stream/aes128ctr/portable/consts_aes128ctr.c",
+                    "crypto_stream/aes128ctr/portable/int128_aes128ctr.c",
+                    "crypto_stream/aes128ctr/portable/stream_aes128ctr.c",
+                    "crypto_stream/aes128ctr/portable/xor_afternm_aes128ctr.c",
+                    "crypto_stream/aes256estream/hongjun/aes256-ctr.c",
+                    "crypto_stream/aes256estream/stream_aes256estream_api.c",
+                    "crypto_stream/salsa2012/stream_salsa2012_api.c",
+                    "crypto_stream/salsa2012/ref/stream_salsa2012.c",
+                    "crypto_stream/salsa2012/ref/xor_salsa2012.c",
+                    "crypto_stream/salsa208/stream_salsa208_api.c",
+                    "crypto_stream/salsa208/ref/stream_salsa208.c",
+                    "crypto_stream/salsa208/ref/xor_salsa208.c",
+                    "crypto_stream/xsalsa20/stream_xsalsa20_api.c",
+                    "crypto_stream/xsalsa20/ref/stream_xsalsa20.c",
+                    "crypto_stream/xsalsa20/ref/xor_xsalsa20.c",
+                    "crypto_verify/16/verify_16_api.c",
+                    "crypto_verify/16/ref/verify_16.c",
+                    "crypto_verify/32/verify_32_api.c",
+                    "crypto_verify/32/ref/verify_32.c",
+                    "randombytes/randombytes.c",
+                    "randombytes/salsa20/randombytes_salsa20_random.c",
+                    "randombytes/sysrandom/randombytes_sysrandom.c",
+                    "sodium/compat.c",
+                    "sodium/core.c",
+                    "sodium/utils.c",
+                    "sodium/version.c",
+
+                    # THIS STUFF IS UNDEFINED?
+                    "crypto_scalarmult/curve25519/scalarmult_curve25519_api.c",
+                    "crypto_scalarmult/curve25519/ref/base_curve25519_ref.c",
+                    "crypto_scalarmult/curve25519/ref/smult_curve25519_ref.c",
+                    # "crypto_scalarmult/curve25519/donna_c64/base_curve25519_donna_c64.c",
+                    # "crypto_scalarmult/curve25519/donna_c64/smult_curve25519_donna_c64.c",
+                    "crypto_stream/salsa20/ref/stream_salsa20_ref.c",
+                    "crypto_stream/salsa20/ref/xor_salsa20_ref.c",
+                ]
+            ],
+        }),
+    ],
+
     zip_safe=False,
     cmdclass={"test": PyTest},