From: Jim Blandy <jimb@redhat.com>
Date: Sun, 30 May 1993 18:24:08 +0000 (+0000)
Subject: * configure.in: Complain if srcdir points at an already-configured
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* configure.in: Complain if srcdir points at an already-configured
	tree.
---

diff --git a/configure1.in b/configure1.in
index 4251cac07d1..9badb35e10d 100755
--- a/configure1.in
+++ b/configure1.in
@@ -354,6 +354,14 @@ case "${srcdir}" in
   *  ) srcdir="`(cd ${srcdir}; pwd)`" ;;
 esac
 
+#### Make sure that the source directory doesn't already have a
+#### configured system in it.
+if [ -f "${srcdir}/src/config.h" ] ; then
+  (echo "${progname}: the directory tree \`${srcdir}' is being used as a build"
+   echo "  directory right now; it has been configured in its own right."
+   echo "  You can't use srcdir in this situation.") >&2
+  exit 1
+fi
 
 ### Make the necessary directories, if they don't exist.
 if [ ! -d ./src ]; then