add a comment about where AC_PROG_LD comes from

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47305 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/configure.ac b/configure.ac
index 33875dc51360af8b93a5c3546c168027c8ad94d7..3fad37427d13ab0f0fb63d44a5169c03888d7240 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -129,6 +129,8 @@ AC_PROG_CC
 AC_PROG_CXX
 AC_PROG_CPP
 AC_PROG_CXXCPP
+# If you get complaints that the following macro is undefined, you probably
+# need to install libtool, as that is what package provides it.
 AC_PROG_LD
 AC_PROG_AWK
 AC_PROG_INSTALL