diff '--color=auto' -NarU 2 a/external/Box2D/Source/Makefile b/external/Box2D/Source/Makefile
--- a/external/Box2D/Source/Makefile	2021-06-18 07:19:06.000000000 -0400
+++ b/external/Box2D/Source/Makefile	2021-07-16 17:01:57.254825075 -0400
@@ -7,5 +7,5 @@
 endif
 
-CXXFLAGS=	-g -O2
+CXXFLAGS ?=	-g -O2
 
 SOURCES = \
diff '--color=auto' -NarU 2 a/makefile b/makefile
--- a/makefile	2021-06-18 07:19:06.000000000 -0400
+++ b/makefile	2021-07-16 17:00:51.421009113 -0400
@@ -38,5 +38,5 @@
 $(TARGET): $(OBJECTS) $(LOCAL_LIBS)
 	$(SILENTMSG) "\tLD\t$@\n"
-	$(SILENTCMD) $(CXX) -o $@ $^ $(LIBS)
+	$(SILENTCMD) $(CXX) -o $@ $^ $(LDFLAGS) $(LIBS)
 
 clean: $(ADDITIONAL_CLEAN_TARGETS)
diff '--color=auto' -NarU 2 a/mk/pkgs.mk b/mk/pkgs.mk
--- a/mk/pkgs.mk	2021-06-18 07:19:06.000000000 -0400
+++ b/mk/pkgs.mk	2021-07-16 17:10:28.636268435 -0400
@@ -1,4 +1,4 @@
 ifneq ($(PKGS),)
-CXXFLAGS += $(shell $(CROSS_COMPILE)pkg-config --cflags $(PKGS))
-LIBS += $(shell $(CROSS_COMPILE)pkg-config --libs $(PKGS))
+CXXFLAGS += $(shell $(PKG_CONFIG) --cflags $(PKGS))
+LIBS += $(shell $(PKG_CONFIG) --libs $(PKGS))
 endif