otherwise breaks with spaces
--
diff --git a/Makefile b/Makefile
index 051fcbb..a604ac2 100644
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,7 @@ endif
 # EXTRA_LD_FLAGS are given by the caller, and are passed to the Go linker after
 # BUILTIN_LD_FLAGS are processed. By default the system LDFLAGS are passed.
 ifdef LDFLAGS
-EXTRA_LD_FLAGS ?= -extldflags ${LDFLAGS}
+EXTRA_LD_FLAGS ?= -extldflags '${LDFLAGS}'
 endif
 # LD_FLAGS is the union of the above two BUILTIN_LD_FLAGS and EXTRA_LD_FLAGS.
 LD_FLAGS = $(BUILTIN_LD_FLAGS) $(EXTRA_LD_FLAGS)