sync code with last improvements from OpenBSD

lib/xcb-util/autogen.sh

@@ -0,0 +1,32 @@
+#! /bin/sh
+
+srcdir=`dirname "$0"`
+test -z "$srcdir" && srcdir=.
+
+ORIGDIR=`pwd`
+cd "$srcdir"
+
+# If this is a git checkout, verify that the submodules are initialized,
+# otherwise autotools will just fail with an unhelpful error message.
+if [ -d ".git" ] && [ -r ".gitmodules" ]
+then
+	# If git is not in PATH, this will not return 0, thus not keeping us
+	# from building. Since the message is worthless when git is not
+	# installed, this is what we want.
+	if git submodule status 2>/dev/null | grep -q '^-'
+	then
+		echo "You have uninitialized git submodules." >&2
+		echo "Please run: git submodule update --init" >&2
+		exit 1
+	fi
+fi
+
+autoreconf -v --install || exit 1
+cd "$ORIGDIR" || exit $?
+
+git config --local --get format.subjectPrefix >/dev/null 2>&1 ||
+    git config --local format.subjectPrefix "PATCH libxcb-util"
+
+if test -z "$NOCONFIGURE"; then
+    exec "$srcdir"/configure "$@"
+fi