diff -r 75af206b48cc -r 7c91655f0352 configure.ac
--- a/configure.ac	Thu Feb 11 23:13:59 2010 -0500
+++ b/configure.ac	Thu Feb 11 23:35:12 2010 -0500
@@ -86,6 +86,13 @@
 
 AC_SUBST(POSIX_CRYPTC)
 
+AC_ARG_WITH([ldap],
+	[AS_HELP_STRING([--without-ldap],[Disable building ldap auth module.])],
+	[],
+	[with_ldap="auto"])
+
+AS_IF([test "x$with_ldap" != "xno"],
+[
 # Thank autoconf and openldap developers for making me do all this stuff.
 LDAP_CFLAGS=""
 LDAP_LIBS=""
@@ -108,6 +115,11 @@
 	CFLAGS="$saveCFLAGS"
 	LIBS="$saveLIBS"
 ])
+dnl with_ldap != no
+])
+
+AS_IF([test "x$with_ldap" = "xyes" && test "x$LDAP_AUTHC" = "x"],
+[AC_MSG_ERROR([LDAP support was explicitly requested but could not be found.])])
 
 AC_SUBST(LDAP_CFLAGS)
 AC_SUBST(LDAP_LIBS)