--- src/Makefile.orig	2018-05-15 08:33:08.000000000 -0700
+++ src/Makefile	2018-12-29 18:26:27.000000000 -0700
@@ -99,9 +99,9 @@
 .PHONY: dirs tools 
 .SECONDARY:
 
-objs/libpbrt.a: $(LIBOBJS)
-	@echo "Building the core rendering library (libpbrt.a)"
-	@ar rcs $@ $(LIBOBJS)
+objs/libpbrt.2.dylib: $(LIBOBJS)
+	@echo "Building the core rendering library (libpbrt.2.dylib)"
+	$(CXX) -dynamiclib -o $@ -current_version 2 -compatibility_version 2 -install_name __PREFIX__/lib/libpbrt.2.dylib $(sort $(LIBOBJS)) $(LIBS)
 
 objs/accelerators_%.o: accelerators/%.cpp
 	@echo "Building object $@"
@@ -171,11 +171,11 @@
 	@echo "Building object $@"
 	@$(CXX) $(CXXFLAGS) -o $@ -c $<
 
-bin/pbrt: objs/main_pbrt.o objs/libpbrt.a
+bin/pbrt: objs/main_pbrt.o objs/libpbrt.2.dylib
 	@echo "Linking $@"
 	@$(CXX) $(CXXFLAGS) -o $@ $^ $(LIBS)
 
-bin/%: objs/tools_%.o objs/libpbrt.a 
+bin/%: objs/tools_%.o objs/libpbrt.2.dylib
 	@echo "Linking $@"
 	@$(CXX) $(CXXFLAGS) -o $@ $^ $(LIBS)