Most people expect /usr/local when an unspecified prefix is used so change to that.
diff --git a/configure.ac b/configure.ac
index 0f7aaf3..18e5f56 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,7 +212,7 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([static int __attribute__((warn_unused_result)
[Define if __attribute__((warn_unused_result))]))
if test "x$prefix" = xNONE; then
- prefix=/usr
+ prefix=/usr/local
fi
AC_DEFINE_UNQUOTED([CGMINER_PREFIX], ["$prefix/bin"], [Path to cgminer install])