$OpenBSD: patch-src_Makefile,v 1.5 2021/02/28 17:41:20 daniel Exp $
Index: src/Makefile
--- src/Makefile.orig
+++ src/Makefile
@@ -10,15 +10,15 @@ BIN = ../prince
 OS      := $(shell uname)
 
 CPPFLAGS += -Wall -D_GNU_SOURCE=1
-CFLAGS += -std=gnu99 -O2
+CFLAGS += -std=gnu99
 
 ifeq ($(OS),Darwin)
 LIBS := $(shell sdl2-config --libs) -lSDL2_image
 CFLAGS += -I/opt/local/include
 CPPFLAGS += -D_THREAD_SAFE -DOSX
 else
-LIBS := $(shell pkg-config --libs   sdl2 SDL2_image)
-CFLAGS += $(shell pkg-config --cflags sdl2 SDL2_image)
+LIBS := $(shell pkg-config --libs   sdl2 SDL2_image) -lm
+CFLAGS += $(shell pkg-config --cflags sdl2 SDL2_image) -I${LOCALBASE}/include
 endif
 
 all: $(BIN)
