Hello. There is libexttextcat version provided by libreoffice team http://www.freedesktop.org/wiki/Software/libexttextcat http://dev-www.libreoffice.org/src/libexttextcat/ which uses pkgconfig. Library name is different: libexttextcat-2.0.so so dovecot configure doesn't find it. Something like this is needed: --- dovecot-2.2.15/configure.ac~ 2014-10-25 05:57:08.000000000 +0200 +++ dovecot-2.2.15/configure.ac 2014-11-14 08:49:02.888452270 +0100 @@ -2747,10 +2747,16 @@ have_lucene_textcat=yes AC_DEFINE(HAVE_LUCENE_TEXTCAT,, Define if you want textcat support for CLucene) ], [ - AC_CHECK_LIB(exttextcat, special_textcat_Init, [ - have_lucene_exttextcat=yes - AC_DEFINE(HAVE_LUCENE_EXTTEXTCAT,, Define if you want textcat (Debian version) support for CLucene) - ]) + if test "$PKG_CONFIG" != "" && $PKG_CONFIG --exists libexttextcat 2>/dev/null; then + PKG_CHECK_MODULES(LIBEXTTEXTCAT, libexttextcat) + LIBS="$LIBS $LIBEXTTEXTCAT_LIBS" + AC_DEFINE(HAVE_LUCENE_EXTTEXTCAT,, Define if you want textcat (LibreOffice version) support for CLucene) + else + AC_CHECK_LIB(exttextcat, special_textcat_Init, [ + have_lucene_exttextcat=yes + AC_DEFINE(HAVE_LUCENE_EXTTEXTCAT,, Define if you want textcat (Debian version) support for CLucene) + ]) + fi ]) ], [ if test $want_stemmer = yes; then -- Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )