multimedia/vapoursynth: Added (video processing framework)

Signed-off-by: Dave Woodfall <dave@slackbuilds.org>

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

5 files changed, 692 insertions, 0 deletions

diff --git a/multimedia/vapoursynth/650.patch b/multimedia/vapoursynth/650.patch
new file mode 100644
index 0000000000..6c2358b951
--- /dev/null
+++ b/multimedia/vapoursynth/650.patch
@@ -0,0 +1,560 @@
+From 14b36ee7a300aa47e08df06241bc409e213edff2 Mon Sep 17 00:00:00 2001
+From: orbea <orbea@riseup.net>
+Date: Fri, 1 Jan 2021 06:28:18 -0800
+Subject: [PATCH] Add missing pthread dependency.
+
+---
+ Makefile.am      |   5 +-
+ configure.ac     |   1 +
+ m4/ax_pthread.m4 | 507 +++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 511 insertions(+), 2 deletions(-)
+ create mode 100644 m4/ax_pthread.m4
+
+diff --git a/Makefile.am b/Makefile.am
+index 123a3488..3844afb7 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -2,6 +2,7 @@ warningflags = -Wall -Wextra -Wno-unused-parameter -Wno-unused-function -Wno-ign
+ commoncflags = -O3 -fvisibility=hidden $(warningflags) -I$(srcdir)/include $(DEBUGCFLAGS) $(MFLAGS) $(UNICODECFLAGS) $(STACKREALIGN)
+ AM_CXXFLAGS = -std=c++11 $(commoncflags)
+ AM_CFLAGS = -std=c99 $(commoncflags)
++ACLOCAL_AMFLAGS = -I m4
+ 
+ 
+ 
+@@ -80,8 +81,8 @@ pkginclude_HEADERS = include/VapourSynth.h \
+ pkgconfig_DATA += pc/vapoursynth.pc
+ 
+ libvapoursynth_la_LDFLAGS = -no-undefined -avoid-version
+-libvapoursynth_la_CPPFLAGS = $(ZIMG_CFLAGS) -DVS_PATH_PLUGINDIR='"$(PLUGINDIR)"'
+-libvapoursynth_la_LIBADD = $(ZIMG_LIBS) $(DLOPENLIB) libexprfilter.la
++libvapoursynth_la_CPPFLAGS = $(PTHREAD_CFLAGS) $(ZIMG_CFLAGS) -DVS_PATH_PLUGINDIR='"$(PLUGINDIR)"'
++libvapoursynth_la_LIBADD = $(PTHREAD_LIBS) $(ZIMG_LIBS) $(DLOPENLIB) libexprfilter.la
+ 
+ 
+ if X86ASM
+diff --git a/configure.ac b/configure.ac
+index b898d411..1566c6e0 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -14,6 +14,7 @@ AC_PROG_CXX
+ 
+ AC_SYS_LARGEFILE
+ AC_FUNC_FSEEKO
++AX_PTHREAD
+ 
+ 
+ AC_ARG_ENABLE([debug], AS_HELP_STRING([--enable-debug], [Enable compilation options required for debugging. (default=no)]))
+diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
+new file mode 100644
+index 00000000..1598d077
+--- /dev/null
++++ b/m4/ax_pthread.m4
+@@ -0,0 +1,507 @@
++# ===========================================================================
++#        https://www.gnu.org/software/autoconf-archive/ax_pthread.html
++# ===========================================================================
++#
++# SYNOPSIS
++#
++#   AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
++#
++# DESCRIPTION
++#
++#   This macro figures out how to build C programs using POSIX threads. It
++#   sets the PTHREAD_LIBS output variable to the threads library and linker
++#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
++#   flags that are needed. (The user can also force certain compiler
++#   flags/libs to be tested by setting these environment variables.)
++#
++#   Also sets PTHREAD_CC to any special C compiler that is needed for
++#   multi-threaded programs (defaults to the value of CC otherwise). (This
++#   is necessary on AIX to use the special cc_r compiler alias.)
++#
++#   NOTE: You are assumed to not only compile your program with these flags,
++#   but also to link with them as well. For example, you might link with
++#   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
++#
++#   If you are only building threaded programs, you may wish to use these
++#   variables in your default LIBS, CFLAGS, and CC:
++#
++#     LIBS="$PTHREAD_LIBS $LIBS"
++#     CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++#     CC="$PTHREAD_CC"
++#
++#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
++#   has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
++#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
++#
++#   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
++#   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
++#   PTHREAD_CFLAGS.
++#
++#   ACTION-IF-FOUND is a list of shell commands to run if a threads library
++#   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
++#   is not found. If ACTION-IF-FOUND is not specified, the default action
++#   will define HAVE_PTHREAD.
++#
++#   Please let the authors know if this macro fails on any platform, or if
++#   you have any other suggestions or comments. This macro was based on work
++#   by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
++#   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
++#   Alejandro Forero Cuervo to the autoconf macro repository. We are also
++#   grateful for the helpful feedback of numerous users.
++#
++#   Updated for Autoconf 2.68 by Daniel Richard G.
++#
++# LICENSE
++#
++#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
++#   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
++#   Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl>
++#
++#   This program is free software: you can redistribute it and/or modify it
++#   under the terms of the GNU General Public License as published by the
++#   Free Software Foundation, either version 3 of the License, or (at your
++#   option) any later version.
++#
++#   This program is distributed in the hope that it will be useful, but
++#   WITHOUT ANY WARRANTY; without even the implied warranty of
++#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
++#   Public License for more details.
++#
++#   You should have received a copy of the GNU General Public License along
++#   with this program. If not, see <https://www.gnu.org/licenses/>.
++#
++#   As a special exception, the respective Autoconf Macro's copyright owner
++#   gives unlimited permission to copy, distribute and modify the configure
++#   scripts that are the output of Autoconf when processing the Macro. You
++#   need not follow the terms of the GNU General Public License when using
++#   or distributing such scripts, even though portions of the text of the
++#   Macro appear in them. The GNU General Public License (GPL) does govern
++#   all other use of the material that constitutes the Autoconf Macro.
++#
++#   This special exception to the GPL applies to versions of the Autoconf
++#   Macro released by the Autoconf Archive. When you make and distribute a
++#   modified version of the Autoconf Macro, you may extend this special
++#   exception to the GPL to apply to your modified version as well.
++
++#serial 27
++
++AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
++AC_DEFUN([AX_PTHREAD], [
++AC_REQUIRE([AC_CANONICAL_HOST])
++AC_REQUIRE([AC_PROG_CC])
++AC_REQUIRE([AC_PROG_SED])
++AC_LANG_PUSH([C])
++ax_pthread_ok=no
++
++# We used to check for pthread.h first, but this fails if pthread.h
++# requires special compiler flags (e.g. on Tru64 or Sequent).
++# It gets checked for in the link test anyway.
++
++# First of all, check if the user has set any of the PTHREAD_LIBS,
++# etcetera environment variables, and if threads linking works using
++# them:
++if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
++        ax_pthread_save_CC="$CC"
++        ax_pthread_save_CFLAGS="$CFLAGS"
++        ax_pthread_save_LIBS="$LIBS"
++        AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
++        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++        LIBS="$PTHREAD_LIBS $LIBS"
++        AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
++        AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
++        AC_MSG_RESULT([$ax_pthread_ok])
++        if test "x$ax_pthread_ok" = "xno"; then
++                PTHREAD_LIBS=""
++                PTHREAD_CFLAGS=""
++        fi
++        CC="$ax_pthread_save_CC"
++        CFLAGS="$ax_pthread_save_CFLAGS"
++        LIBS="$ax_pthread_save_LIBS"
++fi
++
++# We must check for the threads library under a number of different
++# names; the ordering is very important because some systems
++# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
++# libraries is broken (non-POSIX).
++
++# Create a list of thread flags to try. Items with a "," contain both
++# C compiler flags (before ",") and linker flags (after ","). Other items
++# starting with a "-" are C compiler flags, and remaining items are
++# library names, except for "none" which indicates that we try without
++# any flags at all, and "pthread-config" which is a program returning
++# the flags for the Pth emulation library.
++
++ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
++
++# The ordering *is* (sometimes) important.  Some notes on the
++# individual items follow:
++
++# pthreads: AIX (must check this before -lpthread)
++# none: in case threads are in libc; should be tried before -Kthread and
++#       other compiler flags to prevent continual compiler warnings
++# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
++# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
++#           (Note: HP C rejects this with "bad form for `-t' option")
++# -pthreads: Solaris/gcc (Note: HP C also rejects)
++# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
++#      doesn't hurt to check since this sometimes defines pthreads and
++#      -D_REENTRANT too), HP C (must be checked before -lpthread, which
++#      is present but should not be used directly; and before -mthreads,
++#      because the compiler interprets this as "-mt" + "-hreads")
++# -mthreads: Mingw32/gcc, Lynx/gcc
++# pthread: Linux, etcetera
++# --thread-safe: KAI C++
++# pthread-config: use pthread-config program (for GNU Pth library)
++
++case $host_os in
++
++        freebsd*)
++
++        # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
++        # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
++
++        ax_pthread_flags="-kthread lthread $ax_pthread_flags"
++        ;;
++
++        hpux*)
++
++        # From the cc(1) man page: "[-mt] Sets various -D flags to enable
++        # multi-threading and also sets -lpthread."
++
++        ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
++        ;;
++
++        openedition*)
++
++        # IBM z/OS requires a feature-test macro to be defined in order to
++        # enable POSIX threads at all, so give the user a hint if this is
++        # not set. (We don't define these ourselves, as they can affect
++        # other portions of the system API in unpredictable ways.)
++
++        AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
++            [
++#            if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
++             AX_PTHREAD_ZOS_MISSING
++#            endif
++            ],
++            [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
++        ;;
++
++        solaris*)
++
++        # On Solaris (at least, for some versions), libc contains stubbed
++        # (non-functional) versions of the pthreads routines, so link-based
++        # tests will erroneously succeed. (N.B.: The stubs are missing
++        # pthread_cleanup_push, or rather a function called by this macro,
++        # so we could check for that, but who knows whether they'll stub
++        # that too in a future libc.)  So we'll check first for the
++        # standard Solaris way of linking pthreads (-mt -lpthread).
++
++        ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags"
++        ;;
++esac
++
++# Are we compiling with Clang?
++
++AC_CACHE_CHECK([whether $CC is Clang],
++    [ax_cv_PTHREAD_CLANG],
++    [ax_cv_PTHREAD_CLANG=no
++     # Note that Autoconf sets GCC=yes for Clang as well as GCC
++     if test "x$GCC" = "xyes"; then
++        AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
++            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
++#            if defined(__clang__) && defined(__llvm__)
++             AX_PTHREAD_CC_IS_CLANG
++#            endif
++            ],
++            [ax_cv_PTHREAD_CLANG=yes])
++     fi
++    ])
++ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
++
++
++# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
++
++# Note that for GCC and Clang -pthread generally implies -lpthread,
++# except when -nostdlib is passed.
++# This is problematic using libtool to build C++ shared libraries with pthread:
++# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
++# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
++# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
++# To solve this, first try -pthread together with -lpthread for GCC
++
++AS_IF([test "x$GCC" = "xyes"],
++      [ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"])
++
++# Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first
++
++AS_IF([test "x$ax_pthread_clang" = "xyes"],
++      [ax_pthread_flags="-pthread,-lpthread -pthread"])
++
++
++# The presence of a feature test macro requesting re-entrant function
++# definitions is, on some systems, a strong hint that pthreads support is
++# correctly enabled
++
++case $host_os in
++        darwin* | hpux* | linux* | osf* | solaris*)
++        ax_pthread_check_macro="_REENTRANT"
++        ;;
++
++        aix*)
++        ax_pthread_check_macro="_THREAD_SAFE"
++        ;;
++
++        *)
++        ax_pthread_check_macro="--"
++        ;;
++esac
++AS_IF([test "x$ax_pthread_check_macro" = "x--"],
++      [ax_pthread_check_cond=0],
++      [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
++
++
++if test "x$ax_pthread_ok" = "xno"; then
++for ax_pthread_try_flag in $ax_pthread_flags; do
++
++        case $ax_pthread_try_flag in
++                none)
++                AC_MSG_CHECKING([whether pthreads work without any flags])
++                ;;
++
++                *,*)
++                PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"`
++                PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"`
++                AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"])
++                ;;
++
++                -*)
++                AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
++                PTHREAD_CFLAGS="$ax_pthread_try_flag"
++                ;;
++
++                pthread-config)
++                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
++                AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
++                PTHREAD_CFLAGS="`pthread-config --cflags`"
++                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
++                ;;
++
++                *)
++                AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
++                PTHREAD_LIBS="-l$ax_pthread_try_flag"
++                ;;
++        esac
++
++        ax_pthread_save_CFLAGS="$CFLAGS"
++        ax_pthread_save_LIBS="$LIBS"
++        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++        LIBS="$PTHREAD_LIBS $LIBS"
++
++        # Check for various functions.  We must include pthread.h,
++        # since some functions may be macros.  (On the Sequent, we
++        # need a special flag -Kthread to make this header compile.)
++        # We check for pthread_join because it is in -lpthread on IRIX
++        # while pthread_create is in libc.  We check for pthread_attr_init
++        # due to DEC craziness with -lpthreads.  We check for
++        # pthread_cleanup_push because it is one of the few pthread
++        # functions on Solaris that doesn't have a non-functional libc stub.
++        # We try pthread_create on general principles.
++
++        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
++#                       if $ax_pthread_check_cond
++#                        error "$ax_pthread_check_macro must be defined"
++#                       endif
++                        static void *some_global = NULL;
++                        static void routine(void *a)
++                          {
++                             /* To avoid any unused-parameter or
++                                unused-but-set-parameter warning.  */
++                             some_global = a;
++                          }
++                        static void *start_routine(void *a) { return a; }],
++                       [pthread_t th; pthread_attr_t attr;
++                        pthread_create(&th, 0, start_routine, 0);
++                        pthread_join(th, 0);
++                        pthread_attr_init(&attr);
++                        pthread_cleanup_push(routine, 0);
++                        pthread_cleanup_pop(0) /* ; */])],
++            [ax_pthread_ok=yes],
++            [])
++
++        CFLAGS="$ax_pthread_save_CFLAGS"
++        LIBS="$ax_pthread_save_LIBS"
++
++        AC_MSG_RESULT([$ax_pthread_ok])
++        AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
++
++        PTHREAD_LIBS=""
++        PTHREAD_CFLAGS=""
++done
++fi
++
++
++# Clang needs special handling, because older versions handle the -pthread
++# option in a rather... idiosyncratic way
++
++if test "x$ax_pthread_clang" = "xyes"; then
++
++        # Clang takes -pthread; it has never supported any other flag
++
++        # (Note 1: This will need to be revisited if a system that Clang
++        # supports has POSIX threads in a separate library.  This tends not
++        # to be the way of modern systems, but it's conceivable.)
++
++        # (Note 2: On some systems, notably Darwin, -pthread is not needed
++        # to get POSIX threads support; the API is always present and
++        # active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
++        # -pthread does define _REENTRANT, and while the Darwin headers
++        # ignore this macro, third-party headers might not.)
++
++        # However, older versions of Clang make a point of warning the user
++        # that, in an invocation where only linking and no compilation is
++        # taking place, the -pthread option has no effect ("argument unused
++        # during compilation").  They expect -pthread to be passed in only
++        # when source code is being compiled.
++        #
++        # Problem is, this is at odds with the way Automake and most other
++        # C build frameworks function, which is that the same flags used in
++        # compilation (CFLAGS) are also used in linking.  Many systems
++        # supported by AX_PTHREAD require exactly this for POSIX threads
++        # support, and in fact it is often not straightforward to specify a
++        # flag that is used only in the compilation phase and not in
++        # linking.  Such a scenario is extremely rare in practice.
++        #
++        # Even though use of the -pthread flag in linking would only print
++        # a warning, this can be a nuisance for well-run software projects
++        # that build with -Werror.  So if the active version of Clang has
++        # this misfeature, we search for an option to squash it.
++
++        AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
++            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
++            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
++             # Create an alternate version of $ac_link that compiles and
++             # links in two steps (.c -> .o, .o -> exe) instead of one
++             # (.c -> exe), because the warning occurs only in the second
++             # step
++             ax_pthread_save_ac_link="$ac_link"
++             ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
++             ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
++             ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
++             ax_pthread_save_CFLAGS="$CFLAGS"
++             for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
++                AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
++                CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
++                ac_link="$ax_pthread_save_ac_link"
++                AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
++                    [ac_link="$ax_pthread_2step_ac_link"
++                     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
++                         [break])
++                    ])
++             done
++             ac_link="$ax_pthread_save_ac_link"
++             CFLAGS="$ax_pthread_save_CFLAGS"
++             AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
++             ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
++            ])
++
++        case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
++                no | unknown) ;;
++                *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
++        esac
++
++fi # $ax_pthread_clang = yes
++
++
++
++# Various other checks:
++if test "x$ax_pthread_ok" = "xyes"; then
++        ax_pthread_save_CFLAGS="$CFLAGS"
++        ax_pthread_save_LIBS="$LIBS"
++        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
++        LIBS="$PTHREAD_LIBS $LIBS"
++
++        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
++        AC_CACHE_CHECK([for joinable pthread attribute],
++            [ax_cv_PTHREAD_JOINABLE_ATTR],
++            [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
++             for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
++                 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
++                                                 [int attr = $ax_pthread_attr; return attr /* ; */])],
++                                [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
++                                [])
++             done
++            ])
++        AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
++               test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
++               test "x$ax_pthread_joinable_attr_defined" != "xyes"],
++              [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
++                                  [$ax_cv_PTHREAD_JOINABLE_ATTR],
++                                  [Define to necessary symbol if this constant
++                                   uses a non-standard name on your system.])
++               ax_pthread_joinable_attr_defined=yes
++              ])
++
++        AC_CACHE_CHECK([whether more special flags are required for pthreads],
++            [ax_cv_PTHREAD_SPECIAL_FLAGS],
++            [ax_cv_PTHREAD_SPECIAL_FLAGS=no
++             case $host_os in
++             solaris*)
++             ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
++             ;;
++             esac
++            ])
++        AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
++               test "x$ax_pthread_special_flags_added" != "xyes"],
++              [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
++               ax_pthread_special_flags_added=yes])
++
++        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
++            [ax_cv_PTHREAD_PRIO_INHERIT],
++            [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
++                                             [[int i = PTHREAD_PRIO_INHERIT;
++                                               return i;]])],
++                            [ax_cv_PTHREAD_PRIO_INHERIT=yes],
++                            [ax_cv_PTHREAD_PRIO_INHERIT=no])
++            ])
++        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
++               test "x$ax_pthread_prio_inherit_defined" != "xyes"],
++              [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
++               ax_pthread_prio_inherit_defined=yes
++              ])
++
++        CFLAGS="$ax_pthread_save_CFLAGS"
++        LIBS="$ax_pthread_save_LIBS"
++
++        # More AIX lossage: compile with *_r variant
++        if test "x$GCC" != "xyes"; then
++            case $host_os in
++                aix*)
++                AS_CASE(["x/$CC"],
++                    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
++                    [#handle absolute path differently from PATH based program lookup
++                     AS_CASE(["x$CC"],
++                         [x/*],
++                         [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
++                         [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
++                ;;
++            esac
++        fi
++fi
++
++test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
++
++AC_SUBST([PTHREAD_LIBS])
++AC_SUBST([PTHREAD_CFLAGS])
++AC_SUBST([PTHREAD_CC])
++
++# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
++if test "x$ax_pthread_ok" = "xyes"; then
++        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
++        :
++else
++        ax_pthread_ok=no
++        $2
++fi
++AC_LANG_POP
++])dnl AX_PTHREAD
diff --git a/multimedia/vapoursynth/README b/multimedia/vapoursynth/README
new file mode 100644
index 0000000000..76b8668386
--- /dev/null
+++ b/multimedia/vapoursynth/README
@@ -0,0 +1,3 @@
+VapourSynth is an application for video manipulation. Or a plugin. Or
+a library. It’s hard to tell because it has a core library written
+in C++ and a Python module to allow video scripts to be created.
diff --git a/multimedia/vapoursynth/slack-desc b/multimedia/vapoursynth/slack-desc
new file mode 100644
index 0000000000..c247102a84
--- /dev/null
+++ b/multimedia/vapoursynth/slack-desc
@@ -0,0 +1,19 @@
+# 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------------------------------------------------------|
+vapoursynth: vapoursynth (video processing framework)
+vapoursynth:
+vapoursynth: A video processing framework with simplicity in mind.
+vapoursynth:
+vapoursynth: Homepage: https://www.vapoursynth.com/
+vapoursynth:
+vapoursynth:
+vapoursynth:
+vapoursynth:
+vapoursynth:
+vapoursynth:
diff --git a/multimedia/vapoursynth/vapoursynth.SlackBuild b/multimedia/vapoursynth/vapoursynth.SlackBuild
new file mode 100644
index 0000000000..72a383dbf9
--- /dev/null
+++ b/multimedia/vapoursynth/vapoursynth.SlackBuild
@@ -0,0 +1,100 @@
+#!/bin/sh
+
+# Slackware build script for vapoursynth
+
+# Copyright 2020 Hunter Sezen California, USA
+# 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=vapoursynth
+VERSION=${VERSION:-R52}
+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 -eu
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
+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 {} \;
+
+# Fix undefined reference.
+# https://github.com/vapoursynth/vapoursynth/pull/650
+patch -p1 < $CWD/650.patch
+
+autoreconf -fi
+
+CFLAGS="$SLKCFLAGS" \
+CXXFLAGS="$SLKCFLAGS" \
+./configure \
+  --prefix=/usr \
+  --libdir=/usr/lib${LIBDIRSUFFIX} \
+  --disable-static \
+  --build=$ARCH-slackware-linux
+
+make
+make install DESTDIR=$PKG
+
+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 $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a COPYING.LESSER ChangeLog README.md $PKG/usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+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}
diff --git a/multimedia/vapoursynth/vapoursynth.info b/multimedia/vapoursynth/vapoursynth.info
new file mode 100644
index 0000000000..de096be1a1
--- /dev/null
+++ b/multimedia/vapoursynth/vapoursynth.info
@@ -0,0 +1,10 @@
+PRGNAM="vapoursynth"
+VERSION="R52"
+HOMEPAGE="https://www.vapoursynth.com/"
+DOWNLOAD="https://github.com/vapoursynth/vapoursynth/archive/R52/vapoursynth-R52.tar.gz"
+MD5SUM="e6b37c3c7af6902f3835182292668550"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES="python3-Cython zimg"
+MAINTAINER="Hunter Sezen"
+EMAIL="orbea@riseup.net"