Script rumbles on after error

(master) carlo@devel01:~/work/wildfly$ ./build.sh clean
./tools/download-maven.sh: 20: ./tools/download-maven.sh: curl: not found
Archive:  maven.zip
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of maven.zip or
        maven.zip.zip, and cannot find maven.zip.ZIP, period.
mv: cannot stat ‘apache-maven*’: No such file or directory
build.sh: Could not locate Maven; check $MVN or $MAVEN_HOME.