set -ex
die() {
echo "$@" >&2
exit 1
}
test -n "$PROTOBUF_VERSION" || die "PROTOBUF_VERSION env var is undefined"
case "$PROTOBUF_VERSION" in
2*)
basename=protobuf-$PROTOBUF_VERSION
;;
3*)
basename=protobuf-cpp-$PROTOBUF_VERSION
;;
*)
die "unknown protobuf version: $PROTOBUF_VERSION"
;;
esac
curl -sL https://github.com/google/protobuf/releases/download/v$PROTOBUF_VERSION/$basename.tar.gz | tar zx
cd protobuf-$PROTOBUF_VERSION
./configure --prefix=/home/travis && make -j2 && make install