diff --git a/deps/zlib/adler32_simd.c b/deps/zlib/adler32_simd.c
index 1354915cc099ad..f8b07297b93840 100644
--- a/deps/zlib/adler32_simd.c
+++ b/deps/zlib/adler32_simd.c
@@ -50,9 +50,13 @@
 #define NMAX 5552
 
 #if defined(ADLER32_SIMD_SSSE3)
+#ifndef __GNUC__
+#define __attribute__()
+#endif
 
 #include <tmmintrin.h>
 
+__attribute__((target("ssse3")))
 uint32_t ZLIB_INTERNAL adler32_simd_(  /* SSSE3 */
     uint32_t adler,
     const unsigned char *buf,
diff --git a/deps/zlib/crc32_simd.c b/deps/zlib/crc32_simd.c
index c8e5592f38ef1e..27481847e97b90 100644
--- a/deps/zlib/crc32_simd.c
+++ b/deps/zlib/crc32_simd.c
@@ -8,6 +8,9 @@
 #include "crc32_simd.h"
 
 #if defined(CRC32_SIMD_SSE42_PCLMUL)
+#ifndef __GNUC__
+#define __attribute__()
+#endif
 
 /*
  * crc32_sse42_simd_(): compute the crc32 of the buffer, where the buffer
@@ -21,6 +24,7 @@
 #include <smmintrin.h>
 #include <wmmintrin.h>
 
+__attribute__((target("sse4.2,pclmul")))
 uint32_t ZLIB_INTERNAL crc32_sse42_simd_(  /* SSE4.2+PCLMUL */
     const unsigned char *buf,
     z_size_t len,
diff --git a/deps/zlib/crc_folding.c b/deps/zlib/crc_folding.c
index 48d77744aaf47d..54f4b5c9401089 100644
--- a/deps/zlib/crc_folding.c
+++ b/deps/zlib/crc_folding.c
@@ -23,6 +23,10 @@
 #include <immintrin.h>
 #include <wmmintrin.h>
 
+#ifndef __GNUC__
+#define __attribute__()
+#endif
+
 #define CRC_LOAD(s) \
     do { \
         __m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\
@@ -39,6 +43,7 @@
         _mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\
     } while (0);
 
+__attribute__((target("sse4.2,pclmul")))
 ZLIB_INTERNAL void crc_fold_init(deflate_state *const s)
 {
     CRC_LOAD(s)
@@ -53,6 +58,7 @@ ZLIB_INTERNAL void crc_fold_init(deflate_state *const s)
     s->strm->adler = 0;
 }
 
+__attribute__((target("sse4.2,pclmul")))
 local void fold_1(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
@@ -79,6 +85,7 @@ local void fold_1(deflate_state *const s,
     *xmm_crc3 = _mm_castps_si128(ps_res);
 }
 
+__attribute__((target("sse4.2,pclmul")))
 local void fold_2(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
@@ -113,6 +120,7 @@ local void fold_2(deflate_state *const s,
     *xmm_crc3 = _mm_castps_si128(ps_res31);
 }
 
+__attribute__((target("sse4.2,pclmul")))
 local void fold_3(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
@@ -153,6 +161,7 @@ local void fold_3(deflate_state *const s,
     *xmm_crc3 = _mm_castps_si128(ps_res32);
 }
 
+__attribute__((target("sse4.2,pclmul")))
 local void fold_4(deflate_state *const s,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3)
@@ -219,6 +228,7 @@ local const unsigned zalign(32) pshufb_shf_table[60] = {
 	0x0201008f,0x06050403,0x0a090807,0x0e0d0c0b  /* shl  1 (16 -15)/shr15*/
 };
 
+__attribute__((target("sse4.2,pclmul")))
 local void partial_fold(deflate_state *const s, const size_t len,
         __m128i *xmm_crc0, __m128i *xmm_crc1,
         __m128i *xmm_crc2, __m128i *xmm_crc3,
@@ -269,6 +279,7 @@ local void partial_fold(deflate_state *const s, const size_t len,
     *xmm_crc3 = _mm_castps_si128(ps_res);
 }
 
+__attribute__((target("sse4.2,pclmul")))
 ZLIB_INTERNAL void crc_fold_copy(deflate_state *const s,
         unsigned char *dst, const unsigned char *src, long len)
 {
@@ -425,6 +436,7 @@ local const unsigned zalign(16) crc_mask2[4] = {
     0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
 };
 
+__attribute__((target("sse4.2,pclmul")))
 unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s)
 {
     const __m128i xmm_mask  = _mm_load_si128((__m128i *)crc_mask);
diff --git a/deps/zlib/zlib.gyp b/deps/zlib/zlib.gyp
index c73b9adba902de..6f5a8ce3464b31 100644
--- a/deps/zlib/zlib.gyp
+++ b/deps/zlib/zlib.gyp
@@ -91,20 +91,6 @@
                 'x86.c',
               ],
               'conditions': [
-                ['OS!="win" or llvm_version!="0.0"', {
-                  'cflags': [
-                    '-mssse3',
-                    '-msse4.2',
-                    '-mpclmul',
-                  ],
-                  'xcode_settings': {
-                    'OTHER_CFLAGS': [
-                      '-mssse3',
-                      '-msse4.2',
-                      '-mpclmul',
-                    ],
-                  },
-                }],
                 ['target_arch=="x64"', {
                   'defines': [ 'INFLATE_CHUNK_READ_64LE' ],
                 }],