Support Mac OS X in the master Makefile.

Makefile

@@ -1,7 +1,15 @@
 LIBS=-lpcre -lcrypto -lm -lpthread
 CFLAGS=-ggdb -O3 -Wall
 OBJS=vanitygen.o oclvanitygen.o oclvanityminer.o oclengine.o keyconv.o pattern.o util.o
-PROGS=vanitygen oclvanitygen oclvanityminer keyconv
+PROGS=vanitygen keyconv oclvanitygen oclvanityminer
+
+PLATFORM=$(shell uname -s)
+ifeq ($(PLATFORM),Darwin)
+OPENCL_LIBS=-framework OpenCL
+else
+OPENCL_LIBS=-lOpenCL
+endif
+
 
 most: vanitygen keyconv
 
@@ -11,10 +19,10 @@ vanitygen: vanitygen.o pattern.o util.o
 	$(CC) $^ -o $@ $(CFLAGS) $(LIBS)
 
 oclvanitygen: oclvanitygen.o oclengine.o pattern.o util.o
-	$(CC) $^ -o $@ $(CFLAGS) $(LIBS) -lOpenCL
+	$(CC) $^ -o $@ $(CFLAGS) $(LIBS) $(OPENCL_LIBS)
 
 oclvanityminer: oclvanityminer.o oclengine.o pattern.o util.o
-	$(CC) $^ -o $@ $(CFLAGS) $(LIBS) -lOpenCL -lcurl
+	$(CC) $^ -o $@ $(CFLAGS) $(LIBS) $(OPENCL_LIBS) -lcurl
 
 keyconv: keyconv.o util.o
 	$(CC) $^ -o $@ $(CFLAGS) $(LIBS)