configure.ac: Check for the presence of pango 1.22.0 or higher

Tesseract's training tool text2image uses these two functions: 
pango_glyph_item_iter_init_start
pango_glyph_item_iter_next_cluster

That means it requires Pango >=1.22.0:
https://developer.gnome.org/pango/stable/api-index-1-22.html
https://developer.gnome.org/pango/stable/pango-Glyph-Storage.html#pango-glyph-item-iter-init-start
https://developer.gnome.org/pango/stable/pango-Glyph-Storage.html#pango-glyph-item-iter-next-cluster
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Amit D 2018-04-17 14:46:16 +03:00 committed by GitHub
parent 808a10f794
commit cf7c88dc93
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@ -477,9 +477,10 @@ if !($have_icu_uc && $have_icu_i18n); then
fi
# Check location of pango headers
PKG_CHECK_MODULES([pango], [pango], [have_pango=true], [have_pango=false])
PKG_CHECK_MODULES([pango], [pango >= 1.22.0], [have_pango=true], [have_pango=false])
if !($have_pango); then
AC_MSG_WARN([Training tools WILL NOT be built because of missing pango library.])
AC_MSG_WARN([pango 1.22.0 or higher is required, but was not found.])
AC_MSG_WARN([Training tools WILL NOT be built.])
AC_MSG_WARN([Try to install libpango1.0-dev package.])
AM_CONDITIONAL([ENABLE_TRAINING], false)
else