diff --git a/CMakeLists.txt b/CMakeLists.txt
index 72c9fc8..67ab6ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,7 @@ if("${MHTD}" STREQUAL "MHTD-NOTFOUND")
 endif()
 
 find_package(OpenSSL REQUIRED)
+include_directories(${OPENSSL_INCLUDE_DIR})
 
 #set(CMAKE_VERBOSE_MAKEFILE ON)
 set(CMAKE_CONFIGURATION_TYPES "RELEASE;STATIC")
diff --git a/minethd.cpp b/minethd.cpp
index 181421a..02fe275 100644
--- a/minethd.cpp
+++ b/minethd.cpp
@@ -38,12 +38,25 @@ void thd_setaffinity(std::thread::native_handle_type h, uint64_t cpu_id)
 #else
 #include <pthread.h>
 
+#if defined(__APPLE__)
+#include <mach/thread_policy.h>
+#include <mach/thread_act.h>
+#define SYSCTL_CORE_COUNT   "machdep.cpu.core_count"
+#endif
+
 void thd_setaffinity(std::thread::native_handle_type h, uint64_t cpu_id)
 {
+#if defined(__APPLE__)
+	thread_port_t mach_thread;
+	thread_affinity_policy_data_t policy = { cpu_id };
+	mach_thread = pthread_mach_thread_np(h);
+	thread_policy_set(mach_thread, THREAD_AFFINITY_POLICY, (thread_policy_t)&policy, 1);
+#else
 	cpu_set_t mn;
 	CPU_ZERO(&mn);
 	CPU_SET(cpu_id, &mn);
 	pthread_setaffinity_np(h, sizeof(cpu_set_t), &mn);
+#endif
 }
 #endif // _WIN32
 
@@ -177,7 +190,12 @@ std::vector<minethd*>* minethd::thread_starter(miner_work& pWork)
 		minethd* thd = new minethd(pWork, i, &vGpuData[i]);
 
 		if(cfg.cpu_aff >= 0)
+		{
+#if defined(__APPLE__)
+			printer::inst()->print_msg(L1, "WARNING on MacOS thread affinity is only advisory.");
+#endif
 			thd_setaffinity(thd->oWorkThd.native_handle(), cfg.cpu_aff);
+		}
 
 		pvThreads->push_back(thd);
 		if(cfg.cpu_aff >= 0)
diff --git a/msgstruct.h b/msgstruct.h
index 27ab9ab..621f703 100644
--- a/msgstruct.h
+++ b/msgstruct.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <string>
 #include <string.h>
 #include <assert.h>
 
diff --git a/socks.h b/socks.h
index 2d7c94f..7768706 100644
--- a/socks.h
+++ b/socks.h
@@ -76,7 +76,12 @@ inline void sock_close(SOCKET s)
 inline const char* sock_strerror(char* buf, size_t len)
 {
 	buf[0] = '\0';
+#if defined(__APPLE__)
+	strerror_r(errno, buf, len);
+	return buf;
+#else
 	return strerror_r(errno, buf, len);
+#endif
 }
 
 inline const char* sock_gai_strerror(int err, char* buf, size_t len)