If $RBENV_BUILD_ROOT is set, then always ask ruby-build to build $VERSION under that path.

VERSION_NAME="${DEFINITION##*/}"

PREFIX="${RBENV_ROOT}/versions/${VERSION_NAME}"

# If RBENV_BUILD_ROOT is set, then always pass keep options to ruby-build

if [ -n "${RBENV_BUILD_ROOT}" ]; then

  export RUBY_BUILD_BUILD_PATH="${RBENV_BUILD_ROOT}/${VERSION_NAME}"

  RUBY_BUILD_OPTIONS+=" -k"

fi

ruby-build "$DEFINITION" "$PREFIX" "$RUBY_BUILD_OPTIONS"

rbenv rehash