diff --git a/academic/avl/Makefile_patches/Makefile.avl.patch b/academic/avl/Makefile_patches/Makefile.avl.patch
new file mode 100644
index 0000000000..72f218e36d
--- /dev/null
+++ b/academic/avl/Makefile_patches/Makefile.avl.patch
@@ -0,0 +1,123 @@
+--- bin/Makefile	2013-10-06 19:34:54.000000000 -0400
++++ bin/Makefile.avl	2016-09-27 21:49:02.000000000 -0400
+@@ -2,8 +2,7 @@
+ # Makefile for AVL
+ #
+ 
+-BINDIR = /home/codes/bin/
+-INSTALLCMD = install -s
++BINDIR = $(DESTDIR)/usr/bin/
+ 
+ SRC = ../src
+ 
+@@ -18,92 +17,27 @@
+ matrix.o spline.o sgutil.o \
+ second.o
+ 
+-PLTOBJ = ../plotlib/libPlt.a
+-EIGOBJ = ../eispack/eispack.a
+-## EIGOBJ = eispack.o
+-
+-###================================================
+-###  Default compilers and flags
+-FC = f77
+-FFLAGS = -O
+-PLTLIB = -lX11
+-FTNLIB =
++PLTOBJ = ../plotlib/libPlt_gDP.a
++EIGOBJ = ../eispack/eispack_gDP.a
+ 
+-#Subroutine SECOND source file
+-SECOND = second_g77.f
+-
+-##--------------------------
+-
+-# Uncomment flags for desired machine...
+-
+-##--------------------------
+-### DEC Alpha with OSF and DEC f77/f90 compiler
+-#FC = f77
+-#FFLAGS  = -fast -O4 -tune host
+-##--------------------------
+-### SGI setup
+-#FC = f77
+-#FFLAGS  = -O2
+-##--------------------------
+-##  Uncomment for RS/6000
+-#FFLAGS  = -O -qextname
+-##--------------------------
+-##  Uncomment for HP-9000
+-#FFLAGS  = -O +ppu
+-#FTNLIB  = -U77
+-##--------------------------
+-### Absoft Linux f77
+-#FC = f77
+-#FFLAGS  = -O -f -s -W -B108 -N34
+-##--------------------------
+-### f2c/gcc compiler driver 
+-#FC = fort77
+-#FFLAGS  =  -O2 -fomit-frame-pointer
+-##--------------------------
+-### GNU g77
+-#FC = g77
+-#FFLAGS = -O3
+-##--------------------------
+-### Intel Fortran Compiler 8.x
+-FC = ifort
+-FFLAGS = -O 
+-PLTLIB = -L/usr/X11R6/lib -lX11
+-SECOND = second_ifc.f
+-#FTNLIB = -Vaxlib
+-##--------------------------
+-### double-precision option (also need double precision Eispack and libPlt)
+-FFLAGS = -O -r8
+-PLTOBJ = ../plotlib/libPltDP.a
+-
+-##---------------------------------------
+-##  Uncomment for Mac OSX gfortran
+ FC = gfortran
+ 
+-ACHK = -fbounds-check -finit-real=inf -ffpe-trap=invalid,zero,denormal
+-#ACHK =
+-
++#ACHK = -fbounds-check -finit-real=inf -ffpe-trap=invalid,zero,denormal
++ACHK = 
++PLTLIB=-lX11
++FTNLIB=
+ 
+-#FTNLIB = -Vaxlib
+-FTNLIB = 
+ SECOND = second_g77.f
+ 
+-DP =
+-PLTOBJ = ../plotlib/libPlt_gSP.a
+-EIGOBJ = ../eispack/eispack_gSP.a
+-
+-#DP = -fdefault-real-8
+-#PLTOBJ = ../plotlib/libPltDP.a
+-#EIGOBJ = ../eispack/eispack_gDP.a
+-
+-FFLAGS = -O -m64 $(ACHK) $(DP)
+-##---------------------------------------
+-
++DP = -fdefault-real-8
+ 
++FFLAGS = -O2 $(ACHK) $(DP)
+ 
+ all:	 $(PROGS)
+ 
+ install: $(PROGS)
+-	$(INSTALLCMD) $(PROGS) $(BINDIR)
++	install -d -m 0755 $(BINDIR)
++	install -m 0755 $(PROGS) $(BINDIR)
+ 
+ clean: 
+ 	-/bin/rm $(PROGS)
+@@ -114,7 +48,6 @@
+ 
+ avl: $(AOBJS)
+ 	$(FC) -o avl $(AOBJS)  $(ALIBS) $(PLTOBJ) $(EIGOBJ) $(PLTLIB) $(FTNLIB)
+-	$(INSTALLCMD) avl $(BINDIR)
+ 
+ dtest: dtest.o
+ 	$(FC) -o dtest dtest.o
diff --git a/academic/avl/Makefile_patches/Makefile.eispack.patch b/academic/avl/Makefile_patches/Makefile.eispack.patch
new file mode 100644
index 0000000000..eb6aee7ef0
--- /dev/null
+++ b/academic/avl/Makefile_patches/Makefile.eispack.patch
@@ -0,0 +1,28 @@
+--- eispack/Makefile	2013-10-06 19:33:49.000000000 -0400
++++ eispack/Makefile.eispack	2016-09-11 19:26:35.000000000 -0400
+@@ -1,14 +1,10 @@
+-
+ FC = gfortran
+-FLG = -O
++FLG = -O2
+ AR = ar r
+ RAN = ranlib
+ 
+-DP =
+-EISLIB = eispack_gSP.a
+-
+-#DP = -fdefault-real-8
+-#EISLIB = eispack_gDP.a
++DP = -fdefault-real-8
++EISLIB = eispack_gDP.a
+ 
+ 
+ $(EISLIB): eispack.f
+@@ -17,6 +13,5 @@
+ 	$(RAN) $(EISLIB)
+ 
+ clean:
+-	/bin/rm *.o *.a
+-
++	rm *.o *.a
+ 
diff --git a/academic/avl/Makefile_patches/config.make.plotlib.patch b/academic/avl/Makefile_patches/config.make.plotlib.patch
new file mode 100644
index 0000000000..991c2f0b3e
--- /dev/null
+++ b/academic/avl/Makefile_patches/config.make.plotlib.patch
@@ -0,0 +1,25 @@
+--- plotlib/config.make	2013-10-06 19:32:13.000000000 -0400
++++ plotlib/config.make.plotlib	2016-09-11 21:45:12.000000000 -0400
+@@ -7,7 +7,7 @@
+ 
+ 
+ # Set library name 
+-PLTLIB = libPlt_gSP.a
++PLTLIB = libPlt_gDP.a
+ 
+ # Some fortrans need trailing underscores in C interface symbols (see Xwin.c)
+ # This should work for most of the "unix" fortran compilers
+@@ -15,10 +15,10 @@
+ 
+ FC = gfortran
+ CC  = gcc
+-#DP = -fdefault-real-8
++DP = -fdefault-real-8
+ 
+-FFLAGS  = -m64 -O2 $(DP)
+-CFLAGS  = -m64 -O2 $(DEFINE) -I/usr/X11/include
++FFLAGS  = -O2 $(DP)
++CFLAGS  = -O2 $(DEFINE) -I/usr/X11/include
+ AR = ar r
+ RANLIB = ranlib 
+ LINKLIB = -L/usr/X11R6/lib -lX11 
diff --git a/academic/avl/README b/academic/avl/README
new file mode 100644
index 0000000000..bbf44dcd07
--- /dev/null
+++ b/academic/avl/README
@@ -0,0 +1,7 @@
+AVL is a program for the aerodynamic and flight-dynamic analysis of
+rigid aircraft of arbitrary configuration. It employs an extended
+vortex lattice model for the lifting surfaces, together with a
+slender-body model for fuselages and nacelles. General nonlinear flight
+states can be specified. The flight dynamic analysis combines a full
+linearization of the aerodynamic model about any flight state, together
+with specified mass properties.
diff --git a/academic/avl/avl.SlackBuild b/academic/avl/avl.SlackBuild
new file mode 100644
index 0000000000..268fa689c5
--- /dev/null
+++ b/academic/avl/avl.SlackBuild
@@ -0,0 +1,107 @@
+#!/bin/sh
+
+# Slackware build script for avl
+
+# Copyright 2016 Daniel Prosser, Lexington Park, MD
+# 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=avl
+VERSION=${VERSION:-3.35}
+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 $OUTPUT
+cd $TMP
+rm -rf Avl
+tar xvf $CWD/$PRGNAM$VERSION.tgz
+cd Avl
+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 {} \;
+
+# Patches to create correct Makefiles
+patch -p0 < $CWD/Makefile_patches/config.make.plotlib.patch
+patch -p0 < $CWD/Makefile_patches/Makefile.eispack.patch
+patch -p0 < $CWD/Makefile_patches/Makefile.avl.patch
+
+cd plotlib
+  make
+cd -
+cd eispack
+  make
+cd -
+cd bin
+  make
+  make install DESTDIR="$PKG"
+cd -
+
+# This file seems to be useless, and it's weird name causes problems for removepkg
+rm runs/?[A
+
+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 \
+  README avl_doc.txt session1.txt session2.txt version_notes.txt \
+  $PKG/usr/doc/$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
+
+mkdir -p $PKG/usr/share/$PRGNAM
+cp -a runs $PKG/usr/share/$PRGNAM
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
diff --git a/academic/avl/avl.info b/academic/avl/avl.info
new file mode 100644
index 0000000000..9b339a97e5
--- /dev/null
+++ b/academic/avl/avl.info
@@ -0,0 +1,10 @@
+PRGNAM="avl"
+VERSION="3.35"
+HOMEPAGE="http://web.mit.edu/drela/Public/web/avl/"
+DOWNLOAD="http://web.mit.edu/drela/Public/web/avl/avl3.35.tgz"
+MD5SUM="c2afea857271f1cde9c42257acbea350"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES=""
+MAINTAINER="Daniel Prosser"
+EMAIL="dpross1100@msn.com"
diff --git a/academic/avl/slack-desc b/academic/avl/slack-desc
new file mode 100644
index 0000000000..1ccf62f4e0
--- /dev/null
+++ b/academic/avl/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------------------------------------------------------|
+avl: avl (program for aerodynamic and flight-dynamic analysis of aircraft)
+avl:
+avl: AVL is a program for the aerodynamic and flight-dynamic analysis of
+avl: rigid aircraft of arbitrary configuration. It employs an extended
+avl: vortex lattice model for the lifting surfaces, together with a
+avl: slender-body model for fuselages and nacelles. General nonlinear
+avl: flight states can be specified. The flight dynamic analysis combines a
+avl: full linearization of the aerodynamic model about any flight state,
+avl: together with specified mass properties.
+avl:
+avl: Homepage: http://web.mit.edu/drela/Public/web/avl/