configure

#!/bin/bash -ue

: ${OPA_SOURCE_DIR:=$(dirname $0)}
if [ "${OPA_SOURCE_DIR#/}" = "$OPA_SOURCE_DIR" ]; then OPA_SOURCE_DIR=$PWD/$OPA_SOURCE_DIR; fi

help() {
    cat >&2 <<EOF
opalang configure script. Options:
        -prefix <dir>		the final installation prefix
        -release		configure for building in release mode
        -noassert		configure for building in noassert mode
        -ocamldir <dir>		where to find the ocaml libraries
        -ocamlopt <path>	the ocaml compiler to use
        -ocamlfind <path>	use the given ocamlfind to locate libraries
        -no-ocamlfind		don't use ocamlfind
        -no-camlidl		disable features based on camlidl
        -help			shows this message
EOF
# --no-<lib> if available
}

cd "$OPA_SOURCE_DIR"

while [ $# -gt 0 ]; do
    case "$1" in
        -prefix)
            if [ $# -lt 2 ]; then echo "Error: option $1 requires an argument" >&2; exit 1; fi
            shift
            PREFIX=$1
            ;;
        -release)
            IS_RELEASE=1
            ;;
        -noassert)
            OCAMLBUILD_FLAGS="${OCAMLBUILD_FLAGS:-} -tag noassert"
            ;;
        -ocamldir)
            if [ $# -lt 2 ]; then echo "Error: option $1 requires an argument" >&2; exit 1; fi
            shift
            OCAMLLIB=$1
            ;;
        -ocamlopt)
            if [ $# -lt 2 ]; then echo "Error: option $1 requires an argument" >&2; exit 1; fi
            shift
            OCAMLOPT=$1
            ;;
        -ocamlfind)
            if [ $# -lt 2 ]; then echo "Error: option $1 requires an argument" >&2; exit 1; fi
            shift
            OCAMLFIND=$1
            ;;
        -no-ocamlfind)
            NO_OCAMLFIND=1
            ;;
        -no-camlidl)
            NO_CAMLIDL=1
            ;;
        -h|-help|--help)
            help
            exit 0;;
        *)
            echo "Error: unknown option $1" >&2
            echo
            help
            exit 2
    esac
    shift
done

: ${PREFIX:=${MLSTATELIBS:-}}
: ${PREFIX:=/usr/local}
: ${IS_RELEASE:=}

CONFIG_LOG=$PWD/config.log

echo -n >$CONFIG_LOG

echo-check() { echo -n "Checking $*... " >&2 ; echo "# CHECK-START: $*" >>$CONFIG_LOG; }
echo-ok() {
    local opts=; if [ "X$1" = "X-n" ]; then shift; opts="-n"; fi
    echo $opts "$*" >&2 ;  echo $opts -e "# CHECK-OK: $*\n" >>$CONFIG_LOG;
}
echo-ok-tag() { echo "OK" >&2 ;  echo -e "# CHECK-OK\n" >>$CONFIG_LOG; }
echo-err() { echo "$*" >&2 ;  echo -e "# CHECK-FAIL: $*\n" >>$CONFIG_LOG; }

# check OS
echo-check your OS
EXT_LIB="a"
EXT_OBJ="o"
EXT_SHARED="so"
case $(uname) in
    CYGWIN*)
        echo-ok Windows/cygwin
        EXT_LIB="lib"
        EXT_OBJ="obj"
        EXT_SHARED="dll"
        IS_WINDOWS=1;;
    Darwin*)
        echo-ok MacOS
        IS_MAC=1;;
    Linux*)
        echo-ok Linux
        IS_LINUX=1;;
    *)
        echo-err "Not sure, probably Unix / Linux"
        IS_LINUX=1
esac

echo-check your architecture
case $(uname -m) in
    x86_64)
        echo-ok x86_64;;
    i?86)
        echo-ok ix86;;
    *)
        echo-err "$(uname -m)"
        echo "Sorry, this architecture is unsupported at the moment." >&2
        exit 1
esac

lastresort_hint() {
    cat <<EOF

If you have trouble meeting the required dependencies with your distribution,
you may want to have a look at the script installation_helper.sh in the
dependencies/ directory to build them from source.

EOF
}
trap lastresort_hint ERR

# specific platform checks
if [ -n "${IS_MAC:-}" ]; then
    echo-check for GNU coreutils
    if which gsed gtail gmktemp gsort greadlink >/dev/null 2>&1; then echo-ok ok
    else
        echo-err Not found
        echo "GNU coreutils are needed to build OPA."
        if which port >/dev/null 2>&1; then
            echo -e " You should run:\n\tsudo port install coreutils"
        # else #todo# [add useful suggestion here]
        fi
        exit 1
    fi >&2
    . ./platform_helper.sh
fi

# check ocaml version and location
echo-check ocamlopt
if OCAMLOPT=${OCAMLOPT:-$(which ocamlopt.opt)} || OCAMLOPT=${OCAMLOPT:-$(which ocamlopt)}
then echo-ok $OCAMLOPT
else
    echo-err Not found
    echo "Ocaml 3.12 or newer is required. It's usually found in package 'ocaml'."
    false
fi

echo-check ocamlbuild
: ${OCAMLBUILD:=$(dirname $OCAMLOPT)/ocamlbuild}
if [ -n "$IS_RELEASE" ]; then
    OCAMLBUILD_FLAGS="${OCAMLBUILD_FLAGS:-} -tag release -tag noassert"
else
    OCAMLBUILD_FLAGS="${OCAMLBUILD_FLAGS:-} -tag debug"
fi
if [ -x "$OCAMLBUILD" ]
then echo-ok $OCAMLBUILD
else
    echo-err Not found
    echo "Ocamlbuild is required. It should come with your ocaml distribution."
    false
fi

echo-check ocamldir
: ${OCAMLLIB:=$($OCAMLOPT -where)}
echo-ok $OCAMLLIB

export OCAMLLIB

echo-check ocaml version
OCAML_VERSION=$($OCAMLOPT -version)
OCAML_VERSION_MAJOR=${OCAML_VERSION%%.*}
OCAML_VERSION_MIDDLE=${OCAML_VERSION%.*}
OCAML_VERSION_MIDDLE=${OCAML_VERSION_MIDDLE#*.}
if [ $OCAML_VERSION_MAJOR -eq 3 ] && [ $OCAML_VERSION_MIDDLE -ge 12 ]; then
    echo-ok $OCAML_VERSION
else
    echo-err $OCAML_VERSION
    echo "Ocaml 3.12 or newer is required"
    false
fi

echo-check your ocaml setup
check-ocaml () {
    local DIR=$(mktemp -d /tmp/opa-configure.XXXXX)
    trap "rm -rf /tmp/${DIR#/tmp/}" EXIT
    cd $DIR
    cat >test.ml <<EOF
let p = Unix.getpid()
let _ = Printf.printf "%s, %s %dbit" Sys.ocaml_version Sys.os_type Sys.word_size
let _ =
  if Sys.word_size <> 64 then exit 1
  else exit 0
EOF

    echo "# $OCAMLBUILD$OCAMLBUILD_FLAGS -tag use_unix test.native" >> $CONFIG_LOG
    R=0; $OCAMLBUILD$OCAMLBUILD_FLAGS -tag use_unix test.native >test.log 2>&1 || R=$?

    cat test.log >> $CONFIG_LOG

    if [ $R -ne 0 ]; then
        echo-err "could not compile"
        echo "----------"
        tail -n 5 test.log | sed 's/^/	/'
        echo "----------"
        echo "Your ocaml installation seems broken, please fix it"
        false
    fi >&2
    if RET=$(_build/test.native); then
        echo-ok $RET
    else
        R=$?
        echo-err $RET
        echo "Your ocaml seems to be a 32bit version. Please install a native 64 bit package."
        false
    fi >&2
    rm -rf /tmp/${DIR#/tmp/}
    trap - EXIT
    cd "$OPA_SOURCE_DIR"
}
check-ocaml

echo-check for camlp4
: ${CAMLP4O:=$(dirname $OCAMLOPT)/camlp4o}
: ${CAMLP4ORF:=$(dirname $OCAMLOPT)/camlp4orf}
if [ -x "$CAMLP4O" ] && [ -x "$CAMLP4ORF" ]
then echo-ok $CAMLP4O
else
    echo-err Not found
    echo "You need camlp4 to build this package. It is usually found in packages camlp4, camlp4-extra"
    false
fi

# check tools:
# (*) stuff marked with * could maybe be optional and restrict the build correspondingly

# - checking for perl
echo-check for perl 5
if perl -v 2>/dev/null | grep -q 'v5\.'; then
    echo-ok found
else
    echo-err Not found
    echo "You need Perl v5 to build this package ; it's usually found in package perl-base"
    exit 1
fi >&2

# - checking camlidl *
echo-check for camlidl
if [ -n "${NO_CAMLIDL:-}" ]; then
    HAS_CAMLIDL=
    CAMLIDL=
    echo-ok Disabled
elif
    [ -e $OCAMLLIB/libcamlidl.a ] &&
    CAMLIDL=${CAMLIDL:-$(dirname "$OCAMLOPT")/camlidl} && [ -x "$CAMLIDL" ] ||
    CAMLIDL=$(which camlidl)
then
    HAS_CAMLIDL=1
    echo-ok $CAMLIDL
else
    HAS_CAMLIDL=
    echo-err Not found
fi


# check C libs:
#   we depend on libssl, libzip and others, but through
#   ocaml libs, so no need to check them directly
check-c-lib () (
    local LIB=$1; shift
    [ $# -gt 0 ]
    local INCLUDES=("$@")

    local LIBNAME=$(basename "$LIB")
    local LIBDIR=$(dirname "$LIB")
    local INCLUDE_DIR
    for d in {"$OCAMLLIB/..","$OCAMLLIB",/usr/lib,/usr/local/lib}{/$LIBDIR,}; do
        if [ -e $d/lib$LIBNAME.a ]; then
            LD_DIR=$(readlink -f $d)
            INCLUDE_DIR=$LD_DIR/
            INCLUDE_DIR=${INCLUDE_DIR%/lib/*}/include
            break
        fi
    done
    if [ -z "${LD_DIR:-}" ]; then
        echo "could not find lib$LIBNAME.a" >>$CONFIG_LOG
        echo-err Not found
        return 1
    fi >&2

    echo-ok -n "$LD_DIR/lib$LIBNAME.a, "

    # Now checking compile, link & run
    local DIR=$(mktemp -d /tmp/opa-configure.XXXXX)
    trap "rm -rf /tmp/${DIR#/tmp/}" EXIT
    cd $DIR

    {
        for i in "${INCLUDES[@]}"; do echo '#include <'$i'>'; done
        echo 'int main () { return 0; }'
    } >test_$LIBNAME.c

    echo "# gcc -L$LD_DIR -I$INCLUDE_DIR -l$LIBNAME test_$LIBNAME.c -o test_$LIBNAME" >> $CONFIG_LOG
    R=0; gcc -L$LD_DIR -I$INCLUDE_DIR -l$LIBNAME test_$LIBNAME.c -o test_$LIBNAME >check_$LIBNAME.log 2>&1 || R=$?

    cat check_$LIBNAME.log >> $CONFIG_LOG

    if [ $R -ne 0 ]; then
        echo-err "could not compile"
        echo "----------"
        tail -n 5 check_${LIBNAME}.log | sed 's/^/	/'
        echo "----------"
        return 1
    fi >&2
    if ! ./test_$LIBNAME >> $CONFIG_LOG 2>&1; then
        echo-err "compiled program doesn't work"
        return 1
    fi

    echo-ok-tag
    echo "$LIBNAME $LD_DIR $INCLUDE_DIR"
)

HAS_LIBNATPMP=
LIBNATPMP=("")
HAS_MINIUPNPC=
MINIUPNPC=("")
if [ -n "$HAS_CAMLIDL" ]; then
# - checking libnatpmp *
    echo-check libnatpmp
    if LIBNATPMP=($(check-c-lib libnatpmp/natpmp netinet/in.h arpa/inet.h libnatpmp/getgateway.h libnatpmp/natpmp.h)); then
        HAS_LIBNATPMP=1
    else
        LIBNATPMP=("")
    fi

# - checking miniupnpc *
    echo-check miniupnpc
    if MINIUPNPC=($(check-c-lib miniupnpc/miniupnpc miniupnpc/miniwget.h miniupnpc/miniupnpc.h miniupnpc/upnpcommands.h)); then
        HAS_MINIUPNPC=1
    else
        MINIUPNPC=("")
    fi
fi

# check ocaml libs:
#   probably, first try with ocamlfind then fallback to
#   custom check ; ensure consistency with function
#   "get_ocamlfind_directory" in build/myocamlbuild_prefix.ml
echo-check for ocamlfind
if [ -n "${NO_OCAMLFIND:-}" ]; then
    OCAMLFIND=
    echo-ok Disabled
elif  [ -z "${OCAMLFIND:-}" ]; then
    OCAMLFIND=$(dirname $OCAMLOPT)/ocamlfind
    if [ ! -x "$OCAMLFIND" ]; then
        OCAMLFIND=$OCAMLLIB/../../bin/ocamlfind
    fi
    if [ ! -x "$OCAMLFIND" ]; then
        echo-ok "Not found"
        OCAMLFIND=
    else
        echo-ok $OCAMLFIND
    fi
elif [ -x "$OCAMLFIND" ]; then
    echo-ok $OCAMLFIND
else
    echo-err "Not found"
    echo "You specified $OCAMLFIND on the command-line, but it doesn't exist or isn't executable" >&2
    OCAMLFIND=
fi

EXTRA_TAGS="-tag use_unix"
check-ocaml-lib () {
    local MODULE=$1; shift
    local LIB=$1; shift
    local LIBDIR=$1; shift
    [ $# -eq 0 ]

    local DIR=$(mktemp -d /tmp/opa-configure.XXXXX)
    trap "rm -rf /tmp/${DIR#/tmp/}" EXIT
    cd $DIR

    echo "module M = $MODULE" >check_${LIB}.ml

    local libdir_ins=""
    if [ "$LIBDIR" != "$OCAMLLIB" ]; then libdir_ins=' ~dir:"'$LIBDIR'"'; fi
    cat >myocamlbuild.ml <<EOF
let _ = Ocamlbuild_plugin.dispatch (function
  | Ocamlbuild_plugin.After_rules ->
      Ocamlbuild_plugin.ocaml_lib ~extern:true$libdir_ins ~tag_name:"use_my_lib" "$LIB"
  | _ -> ()
)
EOF

    echo "# $OCAMLBUILD$OCAMLBUILD_FLAGS $EXTRA_TAGS -tag use_my_lib check_${LIB}.native" >> $CONFIG_LOG

    R=0; $OCAMLBUILD$OCAMLBUILD_FLAGS $EXTRA_TAGS -tag use_my_lib check_${LIB}.native >check_${LIB}.log 2>&1 || R=$?
    cat check_${LIB}.log >> $CONFIG_LOG

    if [ $R -ne 0 ]; then
        echo-err "could not compile"
        echo "----------"
        tail -n 5 check_${LIB}.log | sed 's/^/	/'
        echo "----------"
        echo "The installation of $LIB seems broken, please fix it (did it come with a different ocaml compiler ?)"
        return 1
    else
        echo-ok-tag
    fi >&2
    rm -rf /tmp/${DIR#/tmp/}
    trap - EXIT
    cd "$OPA_SOURCE_DIR"
}

check-cmxa () {
    local DIR=$1; shift
    [ $# -gt 0 ]
    local canonical_name=$1
    while [ $# -gt 0 ] && [ ! -e "$DIR/$(basename $1).cmxa" ]; do shift; done
    if [ $# -eq 0 ]; then
        echo-err "Not found"
        echo "Please fix your installation of $canonical_name in $LIBDIR: no proper cmxa file was found there." >&2
        return 1
    fi
    echo $1
}

locate-ocaml-lib () {
    local MODULE=$1; shift # one module that the lib contains, to check
    [ $# -gt 0 ] # remaining args: possible lib names (may be usual_dir/libname)

    echo-check for $(basename $1)

    local LIBDIR=""
    local LIB
    local LIB_NAMES=("$@")
    while [ $# -gt 0 ] && [ -z "$LIBDIR" ]; do
        LIB=$(basename $1)
        USUAL_DIR=$(dirname $1)
        [ "$USUAL_DIR" = "." ] && USUAL_DIR=$LIB
        if [ -n "$OCAMLFIND" ] &&
           LIBDIR=$("$OCAMLFIND" query "$LIB" 2>/dev/null)
        then
            LIB=$(check-cmxa $LIBDIR $LIB "${LIB_NAMES[@]}") || return 1
            echo-ok -n "ocamlfind:$LIBDIR, "
        elif [ -d "$OCAMLLIB"/"$USUAL_DIR" ]
        then
            LIB=$(check-cmxa "$OCAMLLIB"/"$USUAL_DIR" $LIB "${LIB_NAMES[@]}") \
                || return 1
            echo-ok -n "+$USUAL_DIR, "
            LIBDIR=+"$USUAL_DIR"
        elif [ -e "$OCAMLLIB"/"$LIB".cmxa ]
        then
            echo-ok -n "$LIB.cmxa, "
            LIBDIR="$OCAMLLIB"
        fi
        shift
    done
    if [ -z "$LIBDIR" ]; then
        echo-err "Not found"
        return 1
    fi

    check-ocaml-lib "$MODULE" "$LIB" "$LIBDIR" || return 1
    echo "$LIBDIR/$LIB"
}
# for libs which are needed (fatal warning)
LIBS_NOT_FOUND=()
lib-not-found () {
    local lib=$1; shift
    local package=$1; shift
    LIBS_NOT_FOUND[${#LIBS_NOT_FOUND[@]}]="$lib (might be found in package $package)"
}

# - checking ocaml-ssl
if ! CONFIG_LIB_OCAMLSSL=$(locate-ocaml-lib "Ssl" "ssl")
then lib-not-found "ocaml_ssl" "libssl-ocaml-dev"
fi

# - checking cryptokit
if ! CONFIG_LIB_CRYPTOKIT=$(EXTRA_TAGS="$EXTRA_TAGS -tag use_nums" locate-ocaml-lib "Cryptokit" "cryptokit")
then lib-not-found "cryptokit" "libcryptokit-ocaml-dev"
fi

# - checking camlzip
if ! CONFIG_LIB_CAMLZIP=$(locate-ocaml-lib "Zip" "camlzip" "zip")
then lib-not-found "camlzip" "libzip-ocaml-dev"
fi

# - checking ocamlgraph
if ! CONFIG_LIB_OCAMLGRAPH=$(locate-ocaml-lib "Graph" "ocamlgraph/graph")
then lib-not-found "ocamlgraph" "libocamlgraph-ocaml-dev"
fi

# - checking ulex
if ! CONFIG_LIB_ULEX=$(locate-ocaml-lib "Ulexing" "ulex" "ulexing")
then lib-not-found "ulex" "ocaml-ulex"
fi

# # - checking camlimages *
# CONFIG_LIB_CAMLIMAGES=$(EXTRA_TAGS="$EXTRA_TAGS -tag use_graphics" locate-ocaml-lib "Jpeg" "camlimages") || true

if [ ${#LIBS_NOT_FOUND[@]} -ne 0 ]; then
    echo
    echo "Not configured. You need the following libraries installed:" >&2
    for lib in "${LIBS_NOT_FOUND[@]}"; do
        echo "  - $lib" >&2
    done
    false
fi

# Output the configuration

dir_opt() {
    local DIR=$(dirname "$1"); shift; [ $# -eq 0 ]
    if [ "$DIR" = "$OCAMLLIB" ]; then echo 'None'
    else echo 'Some "'$DIR'"'
    fi
}

camlbool() { [ $# -eq 1 ]; if [ -n "$1" ]; then echo true; else echo false; fi; }

camlstrtuple() {
    echo -n '"'$1'"'; shift
    while [ $# -gt 0 ]; do
        echo -n ', "'$1'"'; shift
    done
}

camlopt() {
    local cond=$1; shift
    local val=$1; shift
    [ $# -eq 0 ]
    if [ -n "$cond" ]; then echo 'Some ('$val')'
    else echo 'None'
    fi
}

ALL_TAGS_LIST="camlidl libnatpmp miniupnpc"
TAGS_LIST=""
for tag in $ALL_TAGS_LIST; do
    hasvar=HAS_$(tr '[:lower:]' '[:upper:]' <<<"$tag")
    if [ -n "${!hasvar}" ]; then TAGS_LIST="$TAGS_LIST\"$tag\"; "; fi
done

# See config.mli for the documentation and spec of these variables
cat >config.ml <<EOF
let prefix = "$PREFIX"
let ocamllib = "$OCAMLLIB"
let ocamlopt = "$OCAMLOPT"
let ocamlbuild = "$OCAMLBUILD"
let ocamlbuild_flags = "$OCAMLBUILD_FLAGS"
let camlp4o = "$CAMLP4O"
let camlp4orf = "$CAMLP4ORF"

let camlidl = $(camlopt "$HAS_CAMLIDL" '"'"$CAMLIDL"'"')
let libnatpmp = $(camlopt "$HAS_LIBNATPMP" "$(camlstrtuple "${LIBNATPMP[@]}")")
let miniupnpc = $(camlopt "$HAS_MINIUPNPC" "$(camlstrtuple "${MINIUPNPC[@]}")")

let available = [ $TAGS_LIST]
let all_tags = [ $(for t in $ALL_TAGS_LIST; do echo -n "\"$t\"; "; done)]

let is_release = $(camlbool "$IS_RELEASE")
type os = Linux | Mac | Win32 | Cygwin
let os =
  $(if [ -n "${IS_LINUX:-}" ]; then echo Linux
    elif [ -n "${IS_MAC:-}" ]; then echo Mac
    else echo 'match Sys.os_type with "Win32" -> Win32 | "Cygwin" -> Cygwin | _ -> assert false'
    fi)

module Libdir = struct
  let ssl = $(dir_opt "$CONFIG_LIB_OCAMLSSL")
  let cryptokit = $(dir_opt "$CONFIG_LIB_CRYPTOKIT")
  let camlzip_name = "$(basename "$CONFIG_LIB_CAMLZIP")"
  let camlzip = $(dir_opt "$CONFIG_LIB_CAMLZIP")
  let graph = $(dir_opt "$CONFIG_LIB_OCAMLGRAPH")
  let ulex = $(dir_opt "$CONFIG_LIB_ULEX")
end

let ext_lib = "$EXT_LIB"
let ext_obj = "$EXT_OBJ"
let ext_shared = "$EXT_SHARED"

EOF

cat >config.sh <<EOF
PREFIX="$PREFIX"
OCAMLLIB="$OCAMLLIB"
OCAMLOPT="$OCAMLOPT"
OCAMLBUILD="$OCAMLBUILD"
OCAMLBUILD_FLAGS="$OCAMLBUILD_FLAGS"
CAMLP4O="$CAMLP4O"
CAMLP4ORF="$CAMLP4ORF"

HAS_CAMLIDL="$HAS_CAMLIDL"
CAMLIDL="$CAMLIDL"
HAS_LIBNATPMP="$HAS_LIBNATPMP"
LIBNATPMP=(${LIBNATPMP[@]})
HAS_MINIUPNPC="$HAS_MINIUPNPC"
MINIUPNPC=(${MINIUPNPC[@]})
IS_RELEASE="$IS_RELEASE"
IS_LINUX="${IS_LINUX:-}"
IS_WINDOWS="${IS_WINDOWS:-}"
IS_MAC="${IS_MAC:-}"
OS=$(if [ -n "${IS_LINUX:-}" ]; then echo '"Linux"'
     elif [ -n "${IS_MAC:-}" ]; then echo '"Mac"'
     elif [ -n "${IS_WINDOWS:-}" ]; then echo '"Win32"'
     else echo "Error: OS inconsistency" >&2; exit 2
     fi)

LIB_OCAMLSSL_DIR="$(dirname "$CONFIG_LIB_OCAMLSSL")"
LIB_CRYPTOKIT_DIR="$(dirname "$CONFIG_LIB_CRYPTOKIT")"
LIB_CAMLZIP_NAME="$(basename "$CONFIG_LIB_CAMLZIP")"
LIB_CAMLZIP_DIR="$(dirname "$CONFIG_LIB_CAMLZIP")"
LIB_OCAMLGRAPH_DIR="$(dirname "$CONFIG_LIB_OCAMLGRAPH")"
LIB_ULEX_DIR="$(dirname "$CONFIG_LIB_ULEX")"

EXT_LIB="$EXT_LIB"
EXT_OBJ="$EXT_OBJ"
EXT_SHARED="$EXT_SHARED"
EOF

sed 's/=["(]\(.*\)[)"]$/ := \1/' config.sh > config.make
if [ -n "${IS_MAC:-}" ]; then
    echo "INSTALL := gcp -u -L"
fi >>config.make

{
    echo
    echo "Congrats, you're all set. Installation will be done in:"
    echo "	$PREFIX"
    echo
} >&2