This script clearly misses to remove the build dir at times when it exits,

# curl site, at http://curl.haxx.se/auto/

# USAGE:

# testcurl.sh [configure options] > output

# testcurl.sh > output

# version of this script

version=1

build="build-$$"

# remove any previous left-overs

rm -rf $build

rm -rf build-*

# create a dir to build in

mkdir $build