diff -r ea3490d46f4e -r e94f4ffddd1d scripts/crosstool-NG.sh.in
--- a/scripts/crosstool-NG.sh.in	Mon Dec 14 19:17:37 2009 +0100
+++ b/scripts/crosstool-NG.sh.in	Sat Dec 19 12:44:21 2009 +0100
@@ -134,6 +134,9 @@
 # then rescan the options file now:
 . .config
 
+# Sanity check some directories
+CT_TestAndAbort "'CT_PREFIX_DIR' is not set: where should I install?" -z "${CT_PREFIX_DIR}"
+
 # Second kludge: merge user-supplied target CFLAGS with architecture-provided
 # target CFLAGS. Do the same for LDFLAGS in case it happens in the future.
 # Put user-supplied flags at the end, so that they take precedence.