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-rw-r--r--gr-howto-write-a-block/configure.ac8
1 files changed, 7 insertions, 1 deletions
diff --git a/gr-howto-write-a-block/configure.ac b/gr-howto-write-a-block/configure.ac
index 52c4639bb..fc4227d71 100644
--- a/gr-howto-write-a-block/configure.ac
+++ b/gr-howto-write-a-block/configure.ac
@@ -1,5 +1,5 @@
dnl
-dnl Copyright 2004,2005,2007,2008,2009 Free Software Foundation, Inc.
+dnl Copyright 2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
dnl
dnl This file is part of GNU Radio
dnl
@@ -24,6 +24,12 @@ AC_INIT
AC_PREREQ(2.57)
AC_CONFIG_AUX_DIR([.])
+dnl Set the prefix to the default when --prefix is not specified.
+dnl This is critical for variable substitutions in the configure.
+if test "${prefix}" = "NONE"; then
+ prefix=${ac_default_prefix}
+fi
+
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET