AUR - Openfst for python3.7 on Arch Linux

PKGBUILD

# Maintainer: Ayoub Ghriss <[email protected]>
# Save file in folder as PKGBUILD and run "makepkg -si" in the same folder
# Works for Python3.7 on Arch, for other versions, change the Vim replacement line to corresponding folders

pkgname=openfst
pkgver=1.7.2
pkgrel=1
pkgdesc='Library for constructing, combining, optimizing, and searching weighted finite-state transducers (FSTs)'
arch=(i686 x86_64)
url='http://www.openfst.org'
license=(Apache)
depends=(gcc-libs glibc python2 graphviz vim)
options=(!libtool)
source=(http://www.openfst.org/twiki/pub/FST/FstDownload/$pkgname-$pkgver.tar.gz)
sha1sums=(61dc891dd528a4d2a4e1a9ec9e504b5ecac0d509)
sha256sums=(21c3758ff8574dedaf22b0a6b88c2829bbf3b2e59fbf04740ce2cf92029a0f3b)

build() {
  cd $srcdir/$pkgname-$pkgver

  # Options according to http://openfst.cs.nyu.edu/twiki/bin/view/FST/ReadMe
  OPTIONS='--prefix=/usr --disable-dependency-tracking'
  OPTIONS+=' --enable-bin'             # Enable fst::script and command-line binaries;    Default: yes
  OPTIONS+=' --enable-compact-fsts'    # Enable all CompactFst classes;                   Default: no
  OPTIONS+=' --enable-compress'        # Enable compression extension;                    Default: no
  OPTIONS+=' --enable-const-fsts'      # Enable all ConstFst classes;                     Default: no
  OPTIONS+=' --enable-far'             # Enable FAR (FST Archive) extension;              Default: no
  OPTIONS+=' --enable-linear-fsts'     # Enable Linear{Tagger,Classifier}Fst extensions;  Default: no
  OPTIONS+=' --enable-lookahead-fsts'  # Enable LookAheadFst classes;                     Default: no
  OPTIONS+=' --enable-mpdt'            # Enable MPDT extensions;                          Default: no
  OPTIONS+=' --enable-ngram-fsts'      # Enable NGramFst extensions;                      Default: no
  OPTIONS+=' --enable-pdt'             # Enable PDT extensions;                           Default: no
  OPTIONS+=' --enable-python PYTHON=python2'  # Enable Python extensions;                 Default: no

  pip install cython --user
  pushd ./src/extensions/python/
  mv pywrapfst.cc pywrapfst.cc.py2bkup
  vim -c ":1755" -c ':s/"write/b"write' -c ":wq" pywrapfst.pyx
  cython -f --cplus -3 pywrapfst.pyx -o pywrapfst.cc
  popd


  LIBS=-ldl ./configure $OPTIONS

  vim -c ":%s/PYTHON_CPPFLAGS = -I\/usr\/include\/python2.7/PYTHON_CPPFLAGS = -I\/usr\/include\/python3.7m/" -c ":%s/PYTHON_LDFLAGS = -L\/usr\/lib\/python2.7 -lpython2.7/PYTHON_LDFLAGS = -L\/usr\/include\/python3.7/" -c ":%s/PYTHON_SITE_PKG = \/usr\/lib\/python2.7/PYTHON_SITE_PKG = \/usr\/lib\/python3.7\/site-packages/" -c ":%s/PYTHON_VERSION = 2.7/PYTHON_VERSION = 3.7/" -c ":%s/lib\/python2.7\/dist-packages/lib\/python3.7\/dist-packages/" -c ":wq" ./src/extensions/python/Makefile  

  make
}

package() {
  cd $srcdir/$pkgname-$pkgver
  make DESTDIR=$pkgdir install

  install -d $pkgdir/etc/ld.so.conf.d/
  echo /usr/lib/fst > $pkgdir/etc/ld.so.conf.d/openfst.conf
}

Works for Python3.7 on Arch, for other versions, change the Vim replacement line to corresponding folders.
For Ubuntu for example, Python libraries folder has slightly different location, for python 3.5:
vim -c ":%s/PYTHON_CPPFLAGS = -I\/usr\/include\/python2.7/PYTHON_CPPFLAGS = -I\/usr\/include\/python3.5m/" -c ":%s/PYTHON_LDFLAGS = -L\/usr\/lib\/python2.7 -lpython2.7/PYTHON_LDFLAGS = -L\/usr\/include\/python3.5/" -c ":%s/PYTHON_SITE_PKG = \/usr\/lib\/python2.7/PYTHON_SITE_PKG = \/usr\/local\/lib\/python3.5\/site-packages/" -c ":%s/PYTHON_VERSION = 2.7/PYTHON_VERSION = 3.5/" -c ":%s/lib\/python2.7\/dist-packages/lib\/python3.5\/dist-packages/" -c ":wq" ./src/extensions/python/Makefile

See this gist