Manually run autoconf to build tesseract

Instead of using the provided script. Otherwise it'll desperately try to use libtool and its autoconf macros from the system.

component/tesseract/buildout.cfg

 [buildout]
 extends =
+  ../automake/buildout.cfg
   ../libtool/buildout.cfg
   ../leptonica/buildout.cfg
 
@@ -33,12 +34,19 @@ patch-options =
 patches =
   ${tesseract-gcc-4.7-build-patch:location}/${tesseract-gcc-4.7-build-patch:filename}
 configure-command =
-  ./autogen.sh
+  aclocal -I ${libtool:location}/share/aclocal -I config
+  libtoolize -f -c
+  libtoolize --automake
+  autoheader -f
+  automake -c -a -f
+  autoconf -c -Wno-portability
+  autoreconf -i
   ./configure --prefix=${buildout:parts-directory}/${:_buildout_section_name_} --disable-static --datarootdir=${tesseract-share:location}
 
 # tesseract has a non-standard way of testing for leptonica, hence the
 # LIBLEPT_HEADERSDIR entry below:
 environment =
+  PATH=${autoconf:location}/bin:${automake-1.11:location}/bin:${libtool:location}/bin:%(PATH)s
   ACLOCAL_ARGS=-I${libtool:location}/share/aclocal
   LIBLEPT_HEADERSDIR=${leptonica:location}/include
   CPPFLAGS=-I${leptonica:location}/include