$ sudo port install scrollkeeper
--->  Configuring scrollkeeper
Error: Target com.apple.configure returned: configure failure: shell command " cd "/opt/local/var/db/dports/build/_opt_local_var_db_dports_sources_rsync.rsync.darwinports.org_dpupdate_dports_textproc_scrollkeeper/work/scrollkeeper-0.3.14" && ./configure --prefix=/opt/local --mandir=/opt/local/share/man --with-xml-catalog=/opt/local/etc/xml/catalog " returned error 1
Command output: checking for strip... strip
checking for objdir... .libs
checking for gcc option to produce PIC... -fno-common
checking if gcc PIC flag -fno-common works... yes
checking if gcc static flag -static works... no
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.lo... yes
checking if gcc supports -fno-rtti -fno-exceptions... yes
checking whether the linker (/usr/bin/ld) supports shared libraries... yes
checking how to hardcode library paths into programs... unsupported
checking whether stripping libraries is possible... no
checking dynamic linker characteristics... darwin8.9.1 dyld
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking whether -lc should be explicitly linked in... yes
creating libtool
checking for intltool >= 0.28... 0.28 found
checking for perl... /opt/local/bin/perl
checking for an ANSI C-conforming const... yes
checking for getcwd... yes
checking for getwd... yes
checking for putenv... yes
checking for strdup... yes
checking for --with-omfdirs... /usr/share/omf:/usr/local/share/omf:/opt/gnome/share/omf:/opt/gnome-2.0/share/omf:/opt/kde/omf
checking for xml2-config... /opt/local/bin/xml2-config
checking libxml2 version... 2.6.28
checking for xslt-config... /opt/local/bin/xslt-config
checking which XML catalog to use... /opt/local/etc/xml/catalog
checking for DocBook XML DTD... configure: error: not found. Make sure you have the DocBook DTD installed and ensure that it is registered in /opt/local/etc/xml/catalog.