1 files changed, 3 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index d270ffb..9eff3ef 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,8 @@ HEADERS := $(wildcard **.svh)
 CPPSRCS := $(wildcard **.cpp)
 COLLATERAL := $(wildcard **.hex)
 
+OPTS ?=
+
 QUARTUS ?= /opt/quartus-lite/20.1.1.720/
 
 QUARTUS_SH := $(QUARTUS)/quartus/bin/quartus_sh
@@ -23,7 +25,7 @@ pof: build/toycpu.pof
 
 build/Vtop: $(VERILOG) $(HEADERS) $(CPPSRCS) $(COLLATERAL)
         @mkdir -p build
-        verilator +1800-2017ext+sv -Wall -Wno-BLKSEQ -O3 --Mdir build --trace --cc --build --exe --top-module top $(VERILOG) $(CPPSRCS)
+        verilator +1800-2017ext+sv -Wall -Wno-BLKSEQ -O3 $(OPTS) --Mdir build --trace --cc --build --exe --top-module top $(VERILOG) $(CPPSRCS)
 
 build/toycpu.pof: build/toycpu.qpf $(VERILOG) $(COLLATERAL)
         cd build; $(QUARTUS_SH) --flow compile toycpu