s4:build: add some comments to the SMB_EXT_LIB() definition

metze

diff --git a/source4/build/m4/public.m4 b/source4/build/m4/public.m4
index 1927e9977fdefa62262249201ea2142e03f704ed..ffdf92f78444a100315be4579b8f4a8e607ceb62 100644 (file)
--- a/source4/build/m4/public.m4
+++ b/source4/build/m4/public.m4
@@ -157,6 +157,13 @@ mkinclude $1
 "
 ])
 
+dnl
+dnl SMB_EXT_LIB() just specifies the details of the library.
+dnl Note: the library isn't enabled by default.
+dnl You need to enable it with SMB_ENABLE(name) if configure
+dnl find it should be used. E.g. it should not be enabled
+dnl if the library is present, but the header file is missing.
+dnl
 dnl SMB_EXT_LIB(name,libs,cflags,cppflags,ldflags)
 AC_DEFUN([SMB_EXT_LIB],
 [