Possibly working on both Mac and Ubuntu?

Makefile

@@ -45,7 +45,6 @@ testplugin:
 # Set up our precompiled header. This makes building *way* faster (roughly twice as fast).
 # Including it here causes it to be generated.
 # Depends on one of our mbedtls files, to make sure the submodule gets pulled and built.
-UNAME_S := $(shell uname -s)
 PRECOMPILE_D =libstuff/libstuff.d
 PRECOMPILE_INCLUDE =-include libstuff/libstuff.h
 libstuff/libstuff.h.gch libstuff/libstuff.d: libstuff/libstuff.h mbedtls/library/libmbedcrypto.a

test/clustertest/testplugin/Makefile

@@ -51,11 +51,15 @@ ifneq ($(MAKECMDGOALS),clean)
 -include $(DEP)
 endif
 
-LIBRARIES =-lpcrecpp -lbedrock -lstuff -ldl -lpthread -lmbedtls -lmbedx509 -lmbedcrypto -lz
+# OSX needs to re-link the libraries for some reason
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Darwin)
+LIBRARIES = -L../../../ -L../../../mbedtls/library -rdynamic -lpcrecpp -lbedrock -lstuff -ldl -lpthread -lmbedtls -lmbedx509 -lmbedcrypto -lz
+endif
 
 # The main library depends on all the .o files.
 testplugin.so: $(OBJ)
-	$(GXX) $(CXXFLAGS) -shared -o $@ $(OBJ) -lpcrecpp -L../../../ -L../../../mbedtls/library -rdynamic $(LIBRARIES)
+	$(GXX) $(CXXFLAGS) -shared -o $@ $(OBJ) $(LIBRARIES)
 
 # Make dependency files from cpp files, putting them in $INTERMEDIATEDIR.
 # This is the same as making the object files, both dependencies and object files are built together. The only