diff --git a/libsgxstep/Makefile b/libsgxstep/Makefile
index 012d757..4fefe57 100644
--- a/libsgxstep/Makefile
+++ b/libsgxstep/Makefile
@@ -4,7 +4,14 @@ CC          = gcc
 AS          = gcc
 AR          = ar
 ARFLAGS     = -rcs
-CFLAGS     += -DHAS_PSTATE -DHAS_TURBO
+
+ifneq "$(WITH_PSTATE)" "0"
+CPPFLAGS     += -DHAS_PSTATE
+endif
+
+ifneq "$(WITH_TURBO)" "0"
+CPPFLAGS     += -DHAS_TURBO
+endif
 
 ifeq ($(M32), 1)
 	ASFLAGS = -m32 -DM32=1
@@ -25,7 +32,7 @@ $(OUTPUT): $(OBJECTS)
 
 %.o : %.c
 	echo "$(INDENT)[CC] " $<
-	$(CC) $(CFLAGS) $(INCLUDE) -c $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(INCLUDE) -c $<
 
 %.o : %.S
 	echo "$(INDENT)[AS] " $<
diff --git a/libsgxstep/sched.c b/libsgxstep/sched.c
index d8be00a..bf2adfe 100644
--- a/libsgxstep/sched.c
+++ b/libsgxstep/sched.c
@@ -113,10 +113,14 @@ int disable_turbo(void)
 
 int turbo_enabled( void )
 {
+#ifdef HAS_TURBO
 	int result;
-	
-    file_read_int( "/sys/devices/system/cpu/intel_pstate/no_turbo", &result);
+
+  file_read_int( "/sys/devices/system/cpu/intel_pstate/no_turbo", &result);
 	return (result == 0)? 1 : 0;
+#else
+  return 0;
+#endif
 }
 
 int restore_system_state(void)