Step A Build Freetype

Based on https://gist.github.com/anonymous/82ca67d74ca2bd660e6cf51dcd1b4765 .
Original script builds freetype outside of python-apple-support folder
Script below builds freetype inside of python-apple-support folder
Removed ARM6/ARM7 (deprecated) architectures.
Exclude harfbuzz via configure --without-harfbuzz

#!/bin/sh

# based on https://gist.github.com/ayansg/066f3ad7c84f9fd5f61651fc0d099bc3

PROJECT_DIR=$(pwd)
APP_PKGS=$PROJECT_DIR/dist/iOS/app_packages
PYTHON_VERSION=3.7.0
PYTHON_VER=3.7

CFLAGS_iOS=-mios-version-min=8.2
CFLAGS_iphoneos_arm64=-fembed-bitcode
CFLAGS_iphonesimulator_x86_64=-fembed-bitcode

FREETYPE_VERSION=2.9.1

BUILD_DIR=$PROJECT_DIR/build/iOS/freetype-$FREETYPE_VERSION
mkdir -p ${BUILD_DIR}
cd $BUILD_DIR

# Download original freetype source code archive.
if [ ! -e $PROJECT_DIR/downloads/freetype-$FREETYPE_VERSION.tgz ]; then curl --fail -L http://savannah.spinellicreations.com/freetype/freetype-$FREETYPE_VERSION.tar.gz -o $PROJECT_DIR/downloads/freetype-$FREETYPE_VERSION.tgz; fi
# unpack
mkdir -p $BUILD_DIR
tar zxf $PROJECT_DIR/downloads/freetype-$FREETYPE_VERSION.tgz --strip-components 1 -C $BUILD_DIR

cd $BUILD_DIR
echo $(pwd)

XCODE_ROOT=$(xcode-select -print-path)


red=$'\e[1;31m'
grn=$'\e[1;32m'
yel=$'\e[1;33m'
blu=$'\e[1;34m'
mag=$'\e[1;35m'
cyn=$'\e[1;36m'
end=$'\e[0m'


set -e

# do not increase this version number.
iphoneos="8.2"
# do not increase this version number.

ARCH="arm64"
printf "%s\n" "${blu}building iphoneos arm64${end}"
export CC=$(xcrun -sdk iphoneos -find clang)
export CFLAGS="-arch ${ARCH} -pipe -fembed-bitcode -Wno-trigraphs -fpascal-strings -O2 -Wreturn-type -Wunused-variable -fmessage-length=0 -fvisibility=hidden -miphoneos-version-min=$iphoneos -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/libxml2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk"
export AR="/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar"
export LDFLAGS="-arch ${ARCH} -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk -miphoneos-version-min=$iphoneos"
./configure  --without-harfbuzz --host="aarch64-apple-darwin" --enable-static=yes --enable-shared=no
make clean
make
cp objs/.libs/libfreetype.a "${BUILD_DIR}/libfreetype-${ARCH}.a"

ARCH="x86_64"
printf "%s\n" "${blu}building iphonesimulator x86_64${end}"
export CC=$(xcrun -sdk iphonesimulator -find clang)
export CFLAGS="-arch ${ARCH} -pipe -fembed-bitcode=marker -Wno-trigraphs -fpascal-strings -O2 -Wreturn-type -Wunused-variable -fmessage-length=0 -fvisibility=hidden -miphoneos-version-min=$iphoneos -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk"
export LDFLAGS="-arch ${ARCH} -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk -miphoneos-version-min=$iphoneos"
./configure  --without-harfbuzz --disable-shared --enable-static --host="${ARCH}-apple-darwin"
make clean
make
cp objs/.libs/libfreetype.a "${BUILD_DIR}/libfreetype-${ARCH}.a"

printf "%s\n" "${blu}building fatlib${end}"
OUT_A=$PROJECT_DIR/dist/iOS/libfreetype.a
lipo -create "${BUILD_DIR}/libfreetype-arm64.a" "${BUILD_DIR}/libfreetype-x86_64.a" -output $OUT_A
printf "%s\n" "${grn}$(lipo -info $OUT_A)${end}"

Step B Build libpng

Based on insert link here
Builds libpng inside python-apple-support folder

#!/bin/sh

PROJECT_DIR=$(pwd)
APP_PKGS=$PROJECT_DIR/dist/iOS/app_packages
MACOSX_DEPLOYMENT_TARGET=10.14
PYTHON_VERSION=3.7.0
PYTHON_VER=3.7

CFLAGS_iOS=-mios-version-min=11.0
CFLAGS_iphoneos_arm64=-fembed-bitcode
CFLAGS_iphonesimulator_x86_64=-fembed-bitcode

PYTHON_DIR_macOS=build/macOS/Python-$PYTHON_VERSION-macosx.x86_64
PYTHON_HOST=$PYTHON_DIR_macOS/dist/lib/libpython$PYTHON_VERm.a

LPNG_VERSION=1.6.37
XCODE_ROOT=$(xcode-select -print-path)

mkdir -p $PROJECT_DIR/dist/iOS/

#### KIND OF RESET BUILD ENVIRONMENT, BY CHANGING DIR BACK TO ORIGIN
cd $PROJECT_DIR
#### KIND OF RESET BUILD ENVIRONMENT, BY CHANGING DIR BACK TO ORIGIN

# Download original libpng source code archive.
if [ ! -e downloads/libpng-$LPNG_VERSION.tgz ]; then curl --fail -L https://sourceforge.net/projects/libpng/files/libpng16/$LPNG_VERSION/libpng-$LPNG_VERSION.tar.gz/download -o downloads/libpng-$LPNG_VERSION.tgz; fi
# unpack
mkdir -p build/iOS/libpng-$LPNG_VERSION
tar zxf downloads/libpng-$LPNG_VERSION.tgz --strip-components 1 -C build/iOS/libpng-$LPNG_VERSION

# configure and build arm64 iphoneos
echo "building iphoneos arm64"
export CC=$(xcrun -sdk iphoneos -find clang)
export SDKROOT=$(xcrun --sdk iphoneos --show-sdk-path)
export CFLAGS="-O3 -Qunused-arguments -arch arm64 -pipe -no-cpp-precomp -isysroot $SDKROOT $CFLAGS_iOS $CFLAGS_iphoneos_arm64"
export CPPFLAGS=$CFLAGS
export CXXFLAGS="$CFLAGS -Wno-deprecated-register"
mkdir -p $PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos
cd $PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos
../configure --host=arm-apple-darwin64 --enable-shared=no --prefix=$PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos/ios-arm64
make -sj8 
make install
make distclean

# configure and build x86_64 iphonesimulator
echo "building iphonesimulator x86_64"
export CC=$(xcrun -sdk iphonesimulator -find clang)
export SDKROOT=$(xcrun --sdk iphonesimulator --show-sdk-path)
export CFLAGS="-O3 -Qunused-arguments -arch x86_64 -pipe -no-cpp-precomp -isysroot $SDKROOT $CFLAGS_iOS $CFLAGS_iphonesimulator_x86_64"
export CPPFLAGS=$CFLAGS
export CXXFLAGS="$CFLAGS -Wno-deprecated-register"
mkdir -p $PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos
cd $PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos
../configure --host x86_64-apple-darwin --enable-shared=no -prefix=$PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos/simulator-x86_64
make -sj8 
make install
make distclean

# make fatlib
OUT_A=$PROJECT_DIR/dist/iOS/libpng.a
xcrun lipo $PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos/ios-arm64/lib/libpng.a $PROJECT_DIR/build/iOS/libpng-$LPNG_VERSION/iphoneos/simulator-x86_64/lib/libpng.a  -create -output $OUT_A

Step C build kiwisolver

#!/bin/sh


PROJECT_DIR=$(pwd)
APP_PKGS=$PROJECT_DIR/dist/iOS/app_packages
MACOSX_DEPLOYMENT_TARGET=10.14
PYTHON_VERSION=3.7.0
PYTHON_VER=3.7

CFLAGS_iOS=-mios-version-min=12.2
CFLAGS_iphoneos_arm64=-fembed-bitcode
CFLAGS_iphonesimulator_x86_64=-fembed-bitcode
# override machine types for arm64
MACHINE_DETAILED_arm64=aarch64
MACHINE_SIMPLE_arm64=arm

PYTHON_DIR_macOS=$PROJECT_DIR/build/macOS/Python-$PYTHON_VERSION-macosx.x86_64
PYTHON_HOST=$PYTHON_DIR_macOS/dist/lib/libpython$PYTHON_VERm.a

KIWI_VERSION=1.1.0

XCODE_ROOT=$(xcode-select -print-path)

export CC=$XCODE_ROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

HOST_PYTHON=$PROJECT_DIR/build/macOS/python/bin/python3
HOST_PIP=$PROJECT_DIR/build/macOS/python/bin/pip3

red=$'\e[1;31m'
grn=$'\e[1;32m'
yel=$'\e[1;33m'
blu=$'\e[1;34m'
mag=$'\e[1;35m'
cyn=$'\e[1;36m'
end=$'\e[0m'

BUILD_DIR=$PROJECT_DIR/build/iOS/kiwi-$KIWI_VERSION
# Download original kiwisikver source code archive.
if [ ! -e $PROJECT_DIR/downloads/kiwi-$KIWI_VERSION.tgz ]; then curl --fail -L https://github.com/nucleic/kiwi/archive/$KIWI_VERSION.tar.gz -o $PROJECT_DIR/downloads/kiwi-$KIWI_VERSION.tgz; fi
# unpack
mkdir -p $BUILD_DIR
tar zxf $PROJECT_DIR/downloads/kiwi-$KIWI_VERSION.tgz --strip-components 1 -C $BUILD_DIR

cd $BUILD_DIR
echo $(pwd)

# Now builds
# Help on compiler flags https://towardsdatascience.com/how-to-shrink-numpy-scipy-pandas-and-matplotlib-for-your-data-product-4ec8d7e86ee4
printf "%s\n" "${blu}building iphoneos arm64${end}"
export CC=$(xcrun -sdk iphoneos -find clang)
export AR=$(xcrun -sdk iphoneos -find ar)
export SDKROOT=$(xcrun --sdk iphoneos --show-sdk-path)

export CFLAGS="-arch arm64 -isysroot $SDKROOT $CFLAGS_iOS -g0 -O2 -I$SDKROOT -I$PROJECT_DIR/build/iOS/libpng-1.6.37/ -I$PROJECT_DIR/build/iOS/freetype-2.9.1/include -I$PROJECT_DIR/build/iOS/packages/numpy/numpy/core/inlcude/numpy -Wall"
export LDFLAGS="-arch arm64 -L$PROJECT_DIR/dist/iOS/ -isysroot $SDKROOT $CFLAGS_iOS -Wall -v -r"
cd $PROJECT_DIR/build/iOS/kiwi-$KIWI_VERSION
$HOST_PYTHON setup.py build_ext
find . -name "*.o" | xargs $AR -q libkiwisolver-arm64.a

# RESET THE BUILD OUTCOME FOR NEW BUILD
rm -rf  $BUILD_DIR/build/
# RESET THE BUILD OUTCOME FOR NEW BUILD

printf "%s\n" "${blu}building iphonesimulator x86_64${end}"
export CC=$(xcrun -sdk iphonesimulator -find clang)
export AR=$(xcrun -sdk iphonesimulator -find ar)
export SDKROOT=$(xcrun --sdk iphonesimulator --show-sdk-path)

export CFLAGS="-arch x86_64 -isysroot $SDKROOT $CFLAGS_iOS -g0 -O2 -I$SDKROOT -I$PROJECT_DIR/build/iOS/libpng-1.6.37/ -I$PROJECT_DIR/build/iOS/freetype-2.9.1/include -I$PROJECT_DIR/build/iOS/packages/numpy/numpy/core/inlcude/numpy -Wall"
export LDFLAGS="-arch x86_64 -L$PROJECT_DIR/dist/iOS/ -isysroot $SDKROOT $CFLAGS_iOS -Wall -v -r"
cd $PROJECT_DIR/build/iOS/kiwi-$KIWI_VERSION
$HOST_PYTHON setup.py build_ext
find . -name "*.o" | xargs $AR -q libkiwisolver-x86_64.a

cd $PROJECT_DIR/build/iOS/kiwi-$KIWI_VERSION
$HOST_PYTHON setup.py install
## copy from site-package folder

# make fatlib
echo "making fat lib"
OUT_A=$PROJECT_DIR/dist/iOS/libkiwisolver.a
xcrun lipo $PROJECT_DIR/dist/iOS/libkiwisolver-arm64.a $PROJECT_DIR/dist/iOS/libkiwisolver-x86_64.a -create -output $OUT_A

Step D build matplolib

for now simulator only
needs libpng and libfreetype in place

#!/bin/sh

###########################################################################
# Matplotlib
# Matplotlib requires the following dependencies:
# via Python-Apple-Support:
#   - `Python <https://www.python.org/downloads/>`_ (>= 3.5)
#   - `NumPy <http://www.numpy.org>`_ (>= |minimum_numpy_version|)
#   - `setuptools <https://setuptools.readthedocs.io/en/latest/>`_
# compile:
#   - `FreeType <https://www.freetype.org/>`_ (>= 2.3)
#   - `libpng <http://www.libpng.org>`_ (>= 1.2)
# pure-python:
# - `cycler <http://matplotlib.org/cycler/>`_ (>= 0.10.0)
# - `dateutil <https://pypi.python.org/pypi/python-dateutil>`_ (>= 2.1)
# - `kiwisolver <https://github.com/nucleic/kiwi>`_ (>= 1.0.0)
# - `pyparsing <https://pyparsing.wikispaces.com/>`_
##########################################################################

PROJECT_DIR=$(pwd)
APP_PKGS=$PROJECT_DIR/dist/iOS/app_packages
MACOSX_DEPLOYMENT_TARGET=10.14
PYTHON_VERSION=3.7.0
PYTHON_VER=3.7

CFLAGS_iOS=-mios-version-min=11.0
CFLAGS_iphoneos_arm64=-fembed-bitcode
CFLAGS_iphonesimulator_x86_64=-fembed-bitcode
# override machine types for arm64
MACHINE_DETAILED_arm64=aarch64
MACHINE_SIMPLE_arm64=arm

PYTHON_DIR_macOS=build/macOS/Python-$PYTHON_VERSION-macosx.x86_64
PYTHON_HOST=$PYTHON_DIR_macOS/dist/lib/libpython$PYTHON_VERm.a

MPL_VERSION=3.0.2
LPNG_VERSION=1.6.37
FREETYPE_VERSION=2.10.0
XCODE_ROOT=$(xcode-select -print-path)

export CC=$XCODE_ROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
###########################################################################
# Compile all supporting libs that need to be provided.
###########################################################################

###########################################################################
# a) libpng
###########################################################################

#"$PROJECT_DIR/build_libpng.sh"


###########################################################################
# b) freetype
###########################################################################
# "$PROJECT_DIR/build_freetype.sh"
# skipped for now. results of https://gist.github.com/ayansg/066f3ad7c84f9fd5f61651fc0d099bc3
# were placed at PROJECT_DIR=$(pwd)/dist/iOS

###########################################################################
# Install all python dependencies.
###########################################################################
HOST_PYTHON=$PROJECT_DIR/build/macOS/python/bin/python3
HOST_PIP=$PROJECT_DIR/build/macOS/python/bin/pip3
$HOST_PIP install cycler python-dateutil kiwisolver pyparsing

# Download original matplotlib source code archive.
if [ ! -e downloads/matplotlib-$MPL_VERSION.tgz ]; then curl --fail -L https://github.com/matplotlib/matplotlib/archive/v$MPL_VERSION.tar.gz -o downloads/matplotlib-$MPL_VERSION.tgz; fi
# unpack
mkdir -p build/iOS/matplotlib-$MPL_VERSION
tar zxf downloads/matplotlib-$MPL_VERSION.tgz --strip-components 1 -C build/iOS/matplotlib-$MPL_VERSION

# Apply patch
cd $PROJECT_DIR/build/iOS/matplotlib-$MPL_VERSION && patch -p1 -i $PROJECT_DIR/patch/matplotlib/matplotlib.patch

# Now build
# Help on compiler flags https://towardsdatascience.com/how-to-shrink-numpy-scipy-pandas-and-matplotlib-for-your-data-product-4ec8d7e86ee4
export CC=$(xcrun -sdk iphonesimulator -find clang)
export AR=$XCODE_ROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar
export SDKROOT=$(xcrun --sdk iphonesimulator --show-sdk-path)
export CFLAGS="-arch x86_64 -isysroot $SDKROOT $CFLAGS_iOS -g0 -O2 -I$SDKROOT -I$PROJECT_DIR/build/iOS/libpng-1.6.37/ -I$PROJECT_DIR/build/iOS/freetype-2.9.1/include -I$PROJECT_DIR/build/iOS/packages/numpy/numpy/core/inlcude/numpy -Wall"
export LDFLAGS="-arch x86_64 -L$PROJECT_DIR/dist/iOS/ -isysroot $SDKROOT $CFLAGS_iOS -Wall -v -r"

BUILDDIR=$PROJECT_DIR/build/iOS/matplotlib-$MPL_VERSION/build
mkdir -p $BUILDDIR

DISTDIR=$PROJECT_DIR/dist/iOS/app_packages
mkdir -p $DISTDIR

cd $PROJECT_DIR/build/iOS/matplotlib-$MPL_VERSION
$HOST_PYTHON setup.py build_ext -I$BUILDDIR
cd $BUILDDIR
find . -name "*.o" | xargs $AR -q libmatplotlib.a
cd $PROJECT_DIR/build/iOS/matplotlib-$MPL_VERSION
$HOST_PYTHON setup.py install
## copy from site-package folder

The patch file writes out setup.cfg and removes backends
Patches unsupported calls to subprocess / popen (see pyto project).

diff -Nru matplotlib-3.0.2/lib/matplotlib/__init__.py matplotlib-3.0.2-modified/lib/matplotlib/__init__.py
--- matplotlib-3.0.2/lib/matplotlib/__init__.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/__init__.py	2019-06-25 15:17:57.000000000 +0200
@@ -420,6 +420,7 @@
 
 def checkdep_dvipng():
     try:
+        """
         s = subprocess.Popen(['dvipng', '-version'],
                              stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
@@ -427,6 +428,9 @@
         line = stdout.decode('ascii').split('\n')[1]
         v = line.split()[-1]
         return v
+        """
+        # no supported on iOS
+        raise OSError
     except (IndexError, ValueError, OSError):
         return None
 
@@ -457,6 +461,7 @@
 
 def checkdep_pdftops():
     try:
+        """
         s = subprocess.Popen(['pdftops', '-v'], stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
         stdout, stderr = s.communicate()
@@ -465,6 +470,9 @@
             if 'version' in line:
                 v = line.split()[-1]
         return v
+        """
+        # not supported on iOS
+        raise OSError
     except (IndexError, ValueError, UnboundLocalError, OSError):
         return None
 
@@ -472,6 +480,7 @@
 def checkdep_inkscape():
     if checkdep_inkscape.version is None:
         try:
+            """
             s = subprocess.Popen(['inkscape', '-V'],
                                  stdout=subprocess.PIPE,
                                  stderr=subprocess.PIPE)
@@ -482,6 +491,9 @@
                     v = line.split()[1]
                     break
             checkdep_inkscape.version = v
+            """
+            #not supported on iOS
+            raise OSError
         except (IndexError, ValueError, UnboundLocalError, OSError):
             pass
     return checkdep_inkscape.version
@@ -732,7 +744,10 @@
     """
 
     def gen_candidates():
-        yield os.path.join(os.getcwd(), 'matplotlibrc')
+        try:
+            yield os.path.join(os.getcwd(), 'matplotlibrc')
+        except PermissionError:
+            pass
         try:
             matplotlibrc = os.environ['MATPLOTLIBRC']
         except KeyError:
diff -Nru matplotlib-3.0.2/lib/matplotlib/animation.py matplotlib-3.0.2-modified/lib/matplotlib/animation.py
--- matplotlib-3.0.2/lib/matplotlib/animation.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/animation.py	2019-06-25 15:32:45.000000000 +0200
@@ -348,10 +348,13 @@
         command = self._args()
         output = subprocess.PIPE
         _log.info('MovieWriter.run: running command: %s', command)
+        """
         self._proc = subprocess.Popen(command, shell=False,
                                       stdout=output, stderr=output,
                                       stdin=subprocess.PIPE,
                                       creationflags=subprocess_creation_flags)
+        """
+        raise NotImplementedError("Not supported by iOS.")
 
     def finish(self):
         '''Finish any processing for writing the movie.'''
diff -Nru matplotlib-3.0.2/lib/matplotlib/cbook/__init__.py matplotlib-3.0.2-modified/lib/matplotlib/cbook/__init__.py
--- matplotlib-3.0.2/lib/matplotlib/cbook/__init__.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/cbook/__init__.py	2019-06-25 18:16:39.000000000 +0200
@@ -728,8 +728,12 @@
     pid = os.getpid()
     if sys.platform == 'sunos5':
         try:
+            """
             a2 = Popen(['ps', '-p', '%d' % pid, '-o', 'osz'],
                        stdout=PIPE).stdout.readlines()
+            """
+            # not supported on iOS
+            raise OSError
         except OSError:
             raise NotImplementedError(
                 "report_memory works on Sun OS only if "
@@ -737,8 +741,12 @@
         mem = int(a2[-1].strip())
     elif sys.platform == 'linux':
         try:
+            """
             a2 = Popen(['ps', '-p', '%d' % pid, '-o', 'rss,sz'],
                        stdout=PIPE).stdout.readlines()
+            """
+            # not supported on iOS
+            raise OSError
         except OSError:
             raise NotImplementedError(
                 "report_memory works on Linux only if "
@@ -746,8 +754,12 @@
         mem = int(a2[1].split()[1])
     elif sys.platform == 'darwin':
         try:
+            """
             a2 = Popen(['ps', '-p', '%d' % pid, '-o', 'rss,vsz'],
                        stdout=PIPE).stdout.readlines()
+            """
+            # not supported on iOS
+            raise OSError
         except OSError:
             raise NotImplementedError(
                 "report_memory works on Mac OS only if "
@@ -755,8 +767,12 @@
         mem = int(a2[1].split()[0])
     elif sys.platform == 'win32':
         try:
+            """
             a2 = Popen(["tasklist", "/nh", "/fi", "pid eq %d" % pid],
                        stdout=PIPE).stdout.read()
+            """
+            # not supported on iOS
+            raise OSError
         except OSError:
             raise NotImplementedError(
                 "report_memory works on Windows only if "
diff -Nru matplotlib-3.0.2/lib/matplotlib/compat/subprocess.py matplotlib-3.0.2-modified/lib/matplotlib/compat/subprocess.py
--- matplotlib-3.0.2/lib/matplotlib/compat/subprocess.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/compat/subprocess.py	2019-06-25 15:07:12.000000000 +0200
@@ -19,24 +19,15 @@
 
 __all__ = ['Popen', 'PIPE', 'STDOUT', 'check_output', 'CalledProcessError']
 
-
-if hasattr(subprocess, 'Popen'):
-    Popen = subprocess.Popen
-    # Assume that it also has the other constants.
-    PIPE = subprocess.PIPE
-    STDOUT = subprocess.STDOUT
-    CalledProcessError = subprocess.CalledProcessError
-    check_output = subprocess.check_output
-else:
-    # In restricted environments (such as Google App Engine), these are
-    # non-existent. Replace them with dummy versions that always raise OSError.
-    def Popen(*args, **kwargs):
-        raise OSError("subprocess.Popen is not supported")
-
-    def check_output(*args, **kwargs):
-        raise OSError("subprocess.check_output is not supported")
-    PIPE = -1
-    STDOUT = -2
-    # There is no need to catch CalledProcessError. These stubs cannot raise
-    # it. None in an except clause will simply not match any exceptions.
-    CalledProcessError = None
+# In restricted environments (such as Google App Engine), these are
+# non-existent. Replace them with dummy versions that always raise OSError.
+def Popen(*args, **kwargs):
+    raise OSError("subprocess.Popen is not supported")
+    
+def check_output(*args, **kwargs):
+    raise OSError("subprocess.check_output is not supported")
+PIPE = -1
+STDOUT = -2
+# There is no need to catch CalledProcessError. These stubs cannot raise
+# it. None in an except clause will simply not match any exceptions.
+CalledProcessError = None
\ No newline at end of file
diff -Nru matplotlib-3.0.2/lib/matplotlib/dviread.py matplotlib-3.0.2-modified/lib/matplotlib/dviread.py
--- matplotlib-3.0.2/lib/matplotlib/dviread.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/dviread.py	2019-06-25 15:21:18.000000000 +0200
@@ -1018,9 +1018,12 @@
         cmd += ['--format=' + format]
     cmd += [filename]
     _log.debug('find_tex_file(%s): %s', filename, cmd)
+    '''
     pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE)
     result = pipe.communicate()[0].rstrip()
     _log.debug('find_tex_file result: %s', result)
+    '''
+    raise NotImplementedError("Not supported on iOS")
     return result.decode('ascii')
 
 
diff -Nru matplotlib-3.0.2/lib/matplotlib/font_manager.py matplotlib-3.0.2-modified/lib/matplotlib/font_manager.py
--- matplotlib-3.0.2/lib/matplotlib/font_manager.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/font_manager.py	2019-06-25 15:09:30.000000000 +0200
@@ -233,7 +233,11 @@
         'This may take a moment.'))
     timer.start()
     try:
+        """
         out = subprocess.check_output(['fc-list', '--format=%{file}\\n'])
+        """
+        # not supported on iOS
+        raise OSError
     except (OSError, subprocess.CalledProcessError):
         return []
     finally:
@@ -1298,11 +1302,15 @@
         fontexts = get_fontext_synonyms(fontext)
         ext = "." + fontext
         try:
+            """
             pipe = subprocess.Popen(
                 ['fc-match', '-s', '--format=%{file}\\n', pattern],
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE)
             output = pipe.communicate()[0]
+            """
+            # not supported on iOS
+            raise OSError
         except OSError:
             return None
 
diff -Nru matplotlib-3.0.2/lib/matplotlib/texmanager.py matplotlib-3.0.2-modified/lib/matplotlib/texmanager.py
--- matplotlib-3.0.2/lib/matplotlib/texmanager.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/lib/matplotlib/texmanager.py	2019-06-25 15:10:34.000000000 +0200
@@ -291,11 +291,13 @@
         return texfile
 
     def _run_checked_subprocess(self, command, tex):
+        raise NotImplementedError("Tex is not supported by iOS")
         _log.debug(command)
         try:
             report = subprocess.check_output(command,
                                              cwd=self.texcache,
                                              stderr=subprocess.STDOUT)
+            raise subprocess.CalledProcessError(1, command)
         except subprocess.CalledProcessError as exc:
             raise RuntimeError(
                 '{prog} was not able to process the following string:\n'
diff -Nru matplotlib-3.0.2/setup.cfg matplotlib-3.0.2-modified/setup.cfg
--- matplotlib-3.0.2/setup.cfg	1970-01-01 01:00:00.000000000 +0100
+++ matplotlib-3.0.2-modified/setup.cfg	2019-06-25 18:36:02.000000000 +0200
@@ -0,0 +1,14 @@
+[packages]
+tests = False
+sample_data = False
+toolkits = False
+toolkits_tests = False
+
+[gui_support]
+agg = True
+macosx = False
+tkagg = False
+windowing = False
+
+[rc_options]
+backend = Agg
\ No newline at end of file
diff -Nru matplotlib-3.0.2/setup.py matplotlib-3.0.2-modified/setup.py
--- matplotlib-3.0.2/setup.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/setup.py	2019-06-25 18:48:20.000000000 +0200
@@ -65,17 +65,17 @@
     setupext.QhullWrap(),
     setupext.Tri(),
     'Optional subpackages',
-    setupext.SampleData(),
+    #setupext.SampleData(),
     setupext.Toolkits(),
-    setupext.Tests(),
-    setupext.Toolkits_Tests(),
+    #setupext.Tests(),
+    #setupext.Toolkits_Tests(),
     'Optional backend extensions',
     setupext.BackendAgg(),
-    setupext.BackendTkAgg(),
-    setupext.BackendMacOSX(),
-    setupext.Windowing(),
+    #setupext.BackendTkAgg(),
+    #setupext.BackendMacOSX(),
+    #setupext.Windowing(),
     'Optional package data',
-    setupext.Dlls(),
+    #setupext.Dlls(),
     ]
 
 
diff -Nru matplotlib-3.0.2/setupext.py matplotlib-3.0.2-modified/setupext.py
--- matplotlib-3.0.2/setupext.py	2018-11-10 02:06:33.000000000 +0100
+++ matplotlib-3.0.2-modified/setupext.py	2019-06-25 18:24:07.000000000 +0200
@@ -667,7 +667,7 @@
                 *iter_dir('mpl-data/fonts'),
                 *iter_dir('mpl-data/images'),
                 *iter_dir('mpl-data/stylelib'),
-                *iter_dir('backends/web_backend'),
+            #   *iter_dir('backends/web_backend'),
             ]}

Step E include matplotlib

Add pure-python deps to app_packages/ folder
Copy matplotlib

Add libpng.a/libfreetype.a/libmatplotlib.a and libc++1.tbd to XCode-Project

// name all modules, that are a *.so-file within site-packes/matplotlib and subfolders.
// _contour.cpython.....so
// _image.cpython.....so
// _path.cpython.....so
// _png.cpython.....so
// _qhull.cpython.....so
// _tri.cpython.....so
// backends/_backend_agg.cpython.....so
// ft2font.cpython.....so
// ttconf.cpython.....so
// and kiwisolver
void matplotlib_importer() {
  PyRun_SimpleString(
                     "import sys, importlib\n" \
                     "class MatplotlibImporter(object):\n" \
                     "    def find_module(self, fullname, mpath=None):\n" \
                     "        if fullname in (" \
                     "                    'matplotlib._contour', " \
                     "                    'matplotlib._image', " \
                     "                    'matplotlib._path', " \
                     "                    'matplotlib._png', " \
                     "                    'matplotlib._qhull', " \
                     "                    'matplotlib._tri', " \
                     "                    'matplotlib.backends._backend_agg', " \
                     "                    'matplotlib.ft2font', " \
                     "                    'matplotlib.ttconv', " \
                     "                    'kiwisolver', " \
                     "                ):\n" \
                     "            return self\n" \
                     "        return\n" \
                     "    def load_module(self, fullname):\n" \
                     "        f = '__' + fullname.replace('.', '_')\n" \
                     "        mod = sys.modules.get(f)\n" \
                     "        if mod is None:\n" \
                     "            mod = importlib.__import__(f)\n" \
                     "            sys.modules[fullname] = mod\n" \
                     "            return mod\n" \
                     "        return mod\n" \
                     "sys.meta_path.append(MatplotlibImporter())"
                     );
}

// MATPLOTLIB
/*
 nm libmatplotlib.a | grep PyInit
 0000000000000000 T _PyInit__tri
 0000000000000000 T _PyInit_ft2font
 0000000000000560 T _PyInit__path
 0000000000000000 T _PyInit__png
 0000000000000000 T _PyInit__qhull
 0000000000000000 T _PyInit__contour
 0000000000000170 T _PyInit_ttconv
 0000000000000000 T _PyInit__image
 0000000000000370 T _PyInit__tkagg
 0000000000002a60 T _PyInit__backend_agg
 */
extern PyMODINIT_FUNC PyInit__tri(void);
extern PyMODINIT_FUNC PyInit_ft2font(void);
extern PyMODINIT_FUNC PyInit__path(void);
extern PyMODINIT_FUNC PyInit__png(void);
extern PyMODINIT_FUNC PyInit__qhull(void);
extern PyMODINIT_FUNC PyInit__contour(void);
extern PyMODINIT_FUNC PyInit_ttconv(void);
extern PyMODINIT_FUNC PyInit__image(void);
//extern PyMODINIT_FUNC PyInit__tkagg(void);
extern PyMODINIT_FUNC PyInit__backend_agg(void);
/*
 nm libkiwisolver.a | grep PyInit
 0000000000000000 T _PyInit_kiwisolver
 */
extern PyMODINIT_FUNC PyInit_kiwisolver(void);

  PyImport_AppendInittab("__matplotlib__tri", &PyInit__tri);
  PyImport_AppendInittab("__matplotlib_ft2font", &PyInit_ft2font);
  PyImport_AppendInittab("__matplotlib__path", &PyInit__path);
  PyImport_AppendInittab("__matplotlib__png", &PyInit__png);
  PyImport_AppendInittab("__matplotlib__qhull", &PyInit__qhull);
  PyImport_AppendInittab("__matplotlib__contour", &PyInit__contour);
  PyImport_AppendInittab("__matplotlib_ttconv", &PyInit_ttconv);
  PyImport_AppendInittab("__matplotlib__image", &PyInit__image);
  PyImport_AppendInittab("__matplotlib_backends__backend_agg", &PyInit__backend_agg);

  PyImport_AppendInittab("__kiwisolver", &PyInit_kiwisolver);

// If other modules are using threads, we need to initialize them.
  PyEval_InitThreads();
  numpy_importer();
  matplotlib_importer();

Add matplotlib #4

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