$OpenBSD: patch-src_Makefile,v 1.4 2017/11/05 19:29:43 espie Exp $
Index: src/Makefile
--- src/Makefile.orig
+++ src/Makefile
@@ -14,9 +14,9 @@ LIBS := $(shell sdl2-config --libs) -lSDL2_image -lSDL
 INCS := -I/opt/local/include
 CFLAGS += $(INCS) -Wall -std=gnu99 -D_GNU_SOURCE=1 -D_THREAD_SAFE -DOSX -O2
 else
-LIBS := $(shell pkg-config --libs   sdl2 SDL2_image SDL2_mixer)
-INCS := $(shell pkg-config --cflags sdl2 SDL2_image SDL2_mixer)
-CFLAGS += $(INCS) -Wall -std=gnu99 -O2
+LIBS := $(shell pkg-config --libs   sdl2 SDL2_image SDL2_mixer) -lm
+INCS := $(shell pkg-config --cflags sdl2 SDL2_image SDL2_mixer) -I${LOCALBASE}/include
+CFLAGS += $(INCS) -Wall -std=gnu99
 endif
 
 all: $(BIN)
