diff --git a/INSTALL b/INSTALL
index 8cd86e1..5215f20 100644
--- a/INSTALL
+++ b/INSTALL
@@ -31,3 +31,32 @@ After dependencies have been prepared, open a Visual Studio command
 prompt window, and run:
 
 nmake /fMakefile.Win32 vanitygen.exe oclvanitygen.exe
+
+
+Mac OS X:
+
+Prerequisites:
+OpenSSL (0.9.8 is okay, but consider to use 1.0.1 or higher for better performance.)
+pcre/pcre++
+
+It's easy to use "homebrew" tool chains for install OpenSSL and pcre/pcre++.
+If not installed, take the following steps.
+
+1) Install homebeww
+ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go/install)"
+
+2) Install pcre and openssl
+brew install pcre pcre++ openssl
+brew link --force openssl
+
+3) Edit ~/.bash_profile to add PATH environment at the end of the file.
+export PATH=/usr/local/bin:$PATH
+
+4) Fetch the source.
+git clone https://github.com/7m4gmh/vanitygen.git
+
+5) Build.
+cd vanitygen
+make -f Makefile all
+
+
diff --git a/Makefile b/Makefile
index 3486201..4b4905c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,16 @@
-LIBS=-lpcre -lcrypto -lm -lpthread
-CFLAGS=-ggdb -O3 -Wall
+LIBS= -lpcre -lcrypto -lm -lpthread
 OBJS=vanitygen.o oclvanitygen.o oclvanityminer.o oclengine.o keyconv.o pattern.o util.o
 PROGS=vanitygen keyconv oclvanitygen oclvanityminer
 
 PLATFORM=$(shell uname -s)
 ifeq ($(PLATFORM),Darwin)
 OPENCL_LIBS=-framework OpenCL
+INCPATHS=-I$(shell brew --prefix)/include -I$(shell brew --prefix openssl)/include
+LIBPATHS=-L$(shell brew --prefix)/lib -L$(shell brew --prefix openssl)/lib
+CFLAGS=-ggdb -O3 -Wall -Qunused-arguments $(INCPATHS) $(LIBPATHS)
 else
 OPENCL_LIBS=-lOpenCL
+CFLAGS=-ggdb -O3 -Wall
 endif
 
 
diff --git a/vanitygen.c b/vanitygen.c
index 9d88121..92c0056 100644
--- a/vanitygen.c
+++ b/vanitygen.c
@@ -20,7 +20,7 @@
 #include <string.h>
 #include <math.h>
 #include <assert.h>
-
+#include <sys/sysctl.h>
 #include <pthread.h>
 
 #include <openssl/sha.h>
@@ -240,7 +240,18 @@ vg_thread_loop(void *arg)
 }
 
 
-#if !defined(_WIN32)
+#ifdef __APPLE__
+int count_processors(void)
+{
+	int mib[2], count;
+        size_t len;
+        mib[0] = CTL_HW;
+        mib[1] = HW_NCPU;
+        len = sizeof(count);
+        sysctl(mib, 2, &count, &len, NULL, 0);
+	return count;
+}
+#elif !defined(_WIN32)
 int
 count_processors(void)
 {