Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -1,5 +1,5 @@
-CFLAGS  += -std=c99 -Wall -O2 -D_REENTRANT
-LIBS    := -lm -lssl -lcrypto -lpthread
+CFLAGS  += -std=c99 -Wall -D_REENTRANT
+LIBS    += -lm -lssl -lcrypto -lpthread
 
 TARGET  := $(shell uname -s | tr '[A-Z]' '[a-z]' 2>/dev/null || echo unknown)
 
@@ -15,6 +15,9 @@ else ifeq ($(TARGET), linux)
 else ifeq ($(TARGET), freebsd)
 	CFLAGS  += -D_DECLARE_C99_LDBL_MATH
 	LDFLAGS += -Wl,-E
+else ifeq ($(TARGET), openbsd)
+	CFLAGS  += -D_DECLARE_C99_LDBL_MATH
+	LDFLAGS += -Wl,-E
 endif
 
 SRC  := wrk.c net.c ssl.c aprintf.c stats.c script.c units.c \
@@ -31,7 +34,7 @@ CFLAGS  += -I$(ODIR)/include
 LDFLAGS += -L$(ODIR)/lib
 
 ifneq ($(WITH_LUAJIT),)
-	CFLAGS  += -I$(WITH_LUAJIT)/include
+	CFLAGS  += -I$(WITH_LUAJIT)/include/luajit-2.0
 	LDFLAGS += -L$(WITH_LUAJIT)/lib
 else
 	CFLAGS  += -I$(ODIR)/include/luajit-2.1
@@ -52,7 +55,7 @@ clean:
 
 $(BIN): $(OBJ)
 	@echo LINK $(BIN)
-	@$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 $(OBJ): config.h Makefile $(DEPS) | $(ODIR)
 
@@ -61,14 +64,14 @@ $(ODIR):
 
 $(ODIR)/bytecode.c: src/wrk.lua $(DEPS)
 	@echo LUAJIT $<
-	@$(SHELL) -c 'PATH="obj/bin:$(PATH)" luajit -b "$(CURDIR)/$<" "$(CURDIR)/$@"'
+	@$(SHELL) -c 'PATH="obj/bin:$(PATH)" luajit51 -b "$(CURDIR)/$<" "$(CURDIR)/$@"'
 
 $(ODIR)/version.o:
 	@echo 'const char *VERSION="$(VER)";' | $(CC) -xc -c -o $@ -
 
 $(ODIR)/%.o : %.c
 	@echo CC $<
-	@$(CC) $(CFLAGS) -c -o $@ $<
+	$(CC) $(CFLAGS) -c -o $@ $<
 
 # Dependencies