Change default prefix to /opt/libjpeg-turbo


git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@96 632fc199-4ca6-4c93-a231-07263d6284db
diff --git a/configure.ac b/configure.ac
index 0a4cf5c..42c7a93 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,6 +8,7 @@
 AC_INIT([libjpeg-turbo], [0.0.90])
 
 AM_INIT_AUTOMAKE([-Wall foreign dist-bzip2])
+AC_PREFIX_DEFAULT(/opt/libjpeg-turbo)
 
 # Always build with prototypes
 AC_DEFINE([HAVE_PROTOTYPES], 1, [Define if your compiler supports prototypes])