Missing Cygwin/MSYS2 packages

packages.sh

#!/usr/bin/env bash

# Install re2c
cd /tmp                                                  &&
git clone --depth 1 https://github.com/skvadrik/re2c.git &&
cd re2c/re2c                                             &&
./autogen.sh                                             &&
./configure --prefix=/usr                                &&
make -j$(nproc) && make install                          &&
rm -rf /tmp/re2c

# Install ninja
cd /tmp                                                      &&
git clone --depth 1 https://github.com/ninja-build/ninja.git &&
cd ninja                                                     &&
./configure.py --bootstrap                                   &&
mv ninja.exe /usr/bin                                        &&
rm -rf /tmp/ninja

# Install ragel
cd /tmp                                                     &&
wget http://www.colm.net/files/ragel/ragel-6.9.tar.gz       &&
tar -zxvf ragel-6.9.tar.gz                                  &&
cd ragel-*                                                  &&
./configure --prefix=/usr CXXFLAGS="$CXXFLAGS -std=gnu++98" &&
make -j$(nproc) && make install                             &&
rm -rf /tmp/ragel-*

if command grep -q CYGWIN_NT /proc/version; then
  # Install gyp [only needed by Cygwin]
  cd /tmp                                                            &&
  git clone --depth 1 https://chromium.googlesource.com/external/gyp &&
  cd gyp                                                             &&
  python2 setup.py install                                           &&
  rm -rf /tmp/gyp
elif command grep -q MSYS_NT /proc/version ; then
  # Install libjpeg [only needed by MSYS2]
  cd /tmp                                                                      &&
  wget http://downloads.sourceforge.net/project/libjpeg/libjpeg/6b/jpegsr6.zip &&
  unzip jpegsr6                                                                &&
  cd jpeg*                                                                     &&
  sed -i 's@\r@@g' configure                                                   &&
  ./configure --prefix=/usr                                                    &&
  make -j$(nproc) && make install-lib                                          &&
  rm -rf /tmp/jpeg*
fi

# Install rst2pdf
cd /tmp                                   &&
wget https://bootstrap.pypa.io/get-pip.py &&
python2 get-pip.py                        &&
pip install rst2pdf                       &&
rm -f /tmp/get-pip.py