makefile: make SUBDIRS constant

diff --git a/Makefile b/Makefile
index 4289eb4df09d52b6b8ec9a8eae6696176e1cdbec..7411498621ab1706328eff209d0438d99d5c7238 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ else
 UNUSED:=$(shell $(MAKE) loglevels.h)
 endif
 
-SUBDIRS=i3-msg i3-input i3-nagbar i3-config-wizard i3bar
+SUBDIRS:=i3-msg i3-input i3-nagbar i3-config-wizard i3bar
 
 # Depend on the specific file (.c for each .o) and on all headers
 src/%.o: src/%.c ${HEADERS}