Add convenience make target "make lib" in src/
diff --git a/src/Makefile.am b/src/Makefile.am
index 71614a4..c99967f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -13,6 +13,9 @@
 # The following warning options are useful for debugging: -Wpadded
 #AM_CXXFLAGS =
 
+# Convenience targets:
+lib: libharfbuzz.la
+
 lib_LTLIBRARIES = libharfbuzz.la
 
 HBCFLAGS =