diff --git a/Makefile b/Makefile
index b7fdc35..fbd2512 100644
--- a/Makefile
+++ b/Makefile
@@ -16,17 +16,21 @@
 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 
-CC = gcc
+CC = cc
 LD = $(CC)
 RM = rm -f
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Darwin)
+OMPFLAGS = -Xpreprocessor -fopenmp -I$(shell brew --prefix libomp)/include
+OMPFLAGS_MAYBE = $(OMPFLAGS)
+CFLAGS = -Wall -O2 -fomit-frame-pointer $(OMPFLAGS_MAYBE) -DSKIP_MEMZERO
+LDFLAGS = -L$(shell brew --prefix libomp)/lib -lomp $(OMPFLAGS_MAYBE)
+else
 OMPFLAGS = -fopenmp
 OMPFLAGS_MAYBE = $(OMPFLAGS)
-#CFLAGS = -Wall -O2 -fomit-frame-pointer $(OMPFLAGS_MAYBE) -DSKIP_MEMZERO
 CFLAGS = -Wall -O2 -march=native -fomit-frame-pointer $(OMPFLAGS_MAYBE) -DSKIP_MEMZERO
-#CFLAGS = -Wall -O2 -funroll-loops -fomit-frame-pointer $(OMPFLAGS_MAYBE) -DSKIP_MEMZERO
-#CFLAGS = -Wall -O2 -march=native -funroll-loops -fomit-frame-pointer $(OMPFLAGS_MAYBE) -DSKIP_MEMZERO
-# -lrt is for userom's use of clock_gettime()
 LDFLAGS = -s -lrt $(OMPFLAGS_MAYBE)
+endif
 
 PROJ = tests phc-test initrom userom
 OBJS_CORE = yescrypt-opt.o
diff --git a/userom.c b/userom.c
index d8d89d1..c43fa1a 100644
--- a/userom.c
+++ b/userom.c
@@ -297,6 +297,7 @@ int main(int argc, const char * const *argv)
 
 		unsigned long long count1 = count, count_restart = 0;
 
+#ifndef __APPLE__
 		if (!geteuid()) {
 			puts("Running as root, so trying to set SCHED_RR");
 #pragma omp parallel
@@ -306,6 +307,7 @@ int main(int argc, const char * const *argv)
 					perror("sched_setscheduler");
 			}
 		}
+#endif
 
 		start = times(&start_tms);