system/opam: Added (OCaml Package Manager).

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

system/opam/README

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+
+opam - OCaml Package Manager
+
+OPAM is a source-based package manager for OCaml. It supports 
+multiple simultaneous compiler installations, flexible package 
+constraints, and a Git-friendly development workflow. 
+
+Managing your OCaml installation can be as simple as:
+
+    opam list -a         # List the available packages
+    opam install lwt     # Install LWT
+    opam update          # Update the package list
+    ...
+    opam upgrade         # Upgrade the installed packages to their latest version
+
+
+It has to be initialized. To do it, you can use the following command:
+opam init
+
+It is not recommended to run opam from root. Apparently it installs per-user packages.

system/opam/opam.SlackBuild

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+#!/bin/sh
+# Slackware build script for opam
+
+# Copyright 2016-2016  Roberto Metere, Newcastle Upon Tyne, United Kingdom
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PRGNAM=opam
+VERSION=${VERSION:-1.2.2}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $CWD
+cd $TMP
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM-full-$VERSION.tar.gz
+mv $PRGNAM-full-$VERSION $PRGNAM-$VERSION
+cd $PRGNAM-$VERSION
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+./configure \
+  --prefix=/usr \
+  --libdir=/usr/lib${LIBDIRSUFFIX}
+make lib-ext
+make
+make install DESTDIR=$PKG
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a AUTHORS CHANGES CONTRIBUTING.md LICENSE README.md \
+      $PKG/usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+# A file in the $PKG/usr/doc/$PRGNAM-$VERSION can be stripped,
+# so we strip here, rather than immediately after make install.
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}

system/opam/opam.info

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+PRGNAM="opam"
+VERSION="1.2.2"
+HOMEPAGE="https://opam.ocaml.org/"
+DOWNLOAD="https://github.com/ocaml/opam/releases/download/1.2.2/opam-full-1.2.2.tar.gz"
+MD5SUM="7d348c2898795e9f325fb80eaaf5eae8"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES="ocaml"
+MAINTAINER="Roberto Metere"
+EMAIL="roberto@metere.it"

system/opam/slack-desc

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+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+    |-----handy-ruler------------------------------------------------------|
+opam: opam (OCaml Package Manager)
+opam:
+opam: OPAM is a source-based package manager for OCaml. It supports 
+opam: multiple simultaneous compiler installations, flexible package 
+opam: constraints, and a Git-friendly development workflow.
+opam: 
+opam: Homepage: https://opam.ocaml.org/
+opam:
+opam: 
+opam: 
+opam: