Allow local build settings in local.mk

.gitignore

@@ -1,4 +1,6 @@
-build/
+/build/
-.vscode/
+/.vscode/
+
+/local.mk
 
 *.swp

Makefile

@@ -3,7 +3,6 @@
 
 EXEC := bogofilter-smtpd
 
-CXX=/usr/local/Cellar/gcc/9.3.0_1/bin/g++-9
 CXXFLAGS=-std=gnu++17 -Iinclude
 CPPFLAGS=-MMD -MP
 
@@ -14,6 +13,8 @@ SRCS := $(shell find src -name '*.cpp')
 OBJS := $(SRCS:%=$(BUILDDIR)/%.o)
 DEPS := $(OBJS:.o=.d)
 
+-include local.mk
+
 $(BUILDDIR)/$(EXEC) : $(OBJS)
 	$(CXX) -o $@ $^