Don't whine if you can't make the directory.

diff --git a/setup b/setup
index f8ae051..fb10ddf 100755 (executable)
--- a/setup
+++ b/setup
@@ -4,4 +4,4 @@ set -e
 mkaclocal || cp aclocal.glob aclocal.m4
 autoconf
 automake
-mkdir build
+mkdir -p build