Minor CI tweak

  - MAKE=make

  - which gmake 2>/dev/null >/dev/null && MAKE=gmake

  - $MAKE

  # Run tests if they are available (eg. don't fail if "check" isn't a valid make target)

  - $MAKE check || [ "$?" = 2 ]

  # Run tests if they are available

  - $MAKE check

build-debian-7-amd64:

  variables:

    IPV6: "no"

  <<: *debian-7-amd64_env

  <<: *build_job

build-debian-8-amd64:

  variables:

    IPV6: "no"

  <<: *debian-8-amd64_env

  <<: *build_job

build-debian-9-amd64:

  variables:

    IPV6: "no"

  <<: *debian-9-amd64_env

  <<: *build_job

build-debian-testing-amd64:

  variables:

    IPV6: "no"

  <<: *debian-testing-amd64_env

  <<: *build_job

build-fedora-25-amd64:

  variables:

    IPV6: "no"

  <<: *fedora-25-amd64_env

  <<: *build_job

build-fedora-26-amd64:

  variables:

    IPV6: "no"

  <<: *fedora-26-amd64_env

  <<: *build_job

build-centos-6-amd64:

  variables:

    IPV6: "no"

  <<: *centos-6-amd64_env

  <<: *build_job

build-centos-7-amd64:

  variables:

    IPV6: "no"

  <<: *centos-7-amd64_env

  <<: *build_job

build-opensuse-42_3-amd64:

  variables:

    IPV6: "no"

  <<: *opensuse-42_3-amd64_env

  <<: *build_job

build-ubuntu-14_04-amd64:

  variables:

    IPV6: "no"

  <<: *ubuntu-14_04-amd64_env

  <<: *build_job

build-ubuntu-16_04-amd64:

  variables:

    IPV6: "no"

  <<: *ubuntu-16_04-amd64_env

  <<: *build_job

build-debian-7-i386:

  variables:

    IPV6: "no"

  <<: *debian-7-i386_env

  <<: *build_job

build-debian-8-i386:

  variables:

    IPV6: "no"

  <<: *debian-8-i386_env

  <<: *build_job

build-debian-9-i386:

  variables:

    IPV6: "no"

  <<: *debian-9-i386_env

  <<: *build_job

build-debian-testing-i386:

  variables:

    IPV6: "no"

  <<: *debian-testing-i386_env

  <<: *build_job

build-freebsd-11-amd64:

  variables:

    IPV6: "no"

  <<: *freebsd-11-amd64_env

  <<: *build_job

build-freebsd-11-i386:

  variables:

    IPV6: "no"

  <<: *freebsd-11-i386_env

  <<: *build_job