Allow make LDFLAGS=xxx
diff --git a/Makefile b/Makefile
index e82883f..84ac8c1 100644
--- a/Makefile
+++ b/Makefile
@@ -11,14 +11,14 @@
 OSSRCS=src/win/inject.c src/win/dbg.c
 LDOBJS=$(ROOT64)\x86_64-w64-mingw32\lib\CRT_noglob.o
 INSTALLDIR=$(APPDATA)\local\bin
-LDFLAGS=-s
-LDFLAGS32=-s
-LDFLAGS64=-s
+LDFLAGS+=-s
+LDFLAGS32+=-s
+LDFLAGS64+=-s
 else
 
 PLAT=unix
-CPPFLAGS=-D_GNU_SOURCE -D_DEFAULT_SOURCE=1
-LDFLAGS=-g
+CPPFLAGS+=-D_GNU_SOURCE -D_DEFAULT_SOURCE=1
+LDFLAGS+=-g
 
 OS=$(shell uname -s)