I was close to write a similar program, luckily I found yours.
I looked through the source-code and beside some missing error checking I could not find any issues.

Only the libxml2 had problems with some strange umlauts in one logfile. (But I guess here its kopetes fault).

I only did not manage to use the script correctly to merge two directories, so based on the given script, I wrote my own:

ORIGDIR=`dirname $0`
KLT="$ORIGDIR/klt"

printHelp() {
echo "Usage: source target"
echo "both need to be existing directories"
exit 0
}

dirMerge() {
if [ ! -d "$src" ]; then
echo "$src is not a directory" >&2
exit 2
fi
if [ ! -d "$dest" ]; then
echo "$dest is not a directory" >&2
exit 2
fi

for log in `find "$src" |grep xml`; do
#echo "found $log"
name=`basename $log`
log2="$dest/$name"
#echo "target is '$log2'. source is '$log'"
if [ -f "$log2" ]; then
if ! cmp -s "$log" "$log2"; then
logMerge
echo ""
fi
else
cp "$log" "$log2"
echo "copy $log -> $log2"
fi
done
}

logMerge() {
echo "merge $log --> $log2 2"
$KLT merge "$log" "$log2" 2
RETSTATE=$?
if [ "$RETSTATE" -ne "0" ] ; then
echo "Error: merging process failed with status $RETSTATE"
exit 1
fi
}

src=$1
dest=$2

dirMerge

Hi, installed package libxml2-dev, libxml2, cmake 2.6.0, distribution KUbuntu Hardy

cmake processed ok
make failed

make:

martin@notebook:~/Down/klt$ make
/usr/bin/cmake -H/home/martin/Down/klt -B/home/martin/Down/klt --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/martin/Down/klt/CMakeFiles /home/martin/Down/klt/CMakeFiles/progress.make
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/martin/Down/klt'
make -f CMakeFiles/klt.dir/build.make CMakeFiles/klt.dir/depend
make[2]: Entering directory `/home/martin/Down/klt'
cd /home/martin/Down/klt && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/martin/Down/klt /home/martin/Down/klt /home/martin/Down/klt /home/martin/Down/klt /home/martin/Down/klt/CMakeFiles/klt.dir/DependInfo.cmake --color=
make[2]: Leaving directory `/home/martin/Down/klt'
make -f CMakeFiles/klt.dir/build.make CMakeFiles/klt.dir/build
make[2]: Entering directory `/home/martin/Down/klt'
/usr/bin/cmake -E cmake_progress_report /home/martin/Down/klt/CMakeFiles 2
[ 50%] Building C object CMakeFiles/klt.dir/merger.o
/usr/bin/gcc -Wall -g -O2 -o CMakeFiles/klt.dir/merger.o -c /home/martin/Down/klt/merger.c
/home/martin/Down/klt/merger.c:28:27: error: libxml/parser.h: No such file or directory
/home/martin/Down/klt/merger.c:29:25: error: libxml/tree.h: No such file or directory
/home/martin/Down/klt/merger.c:32: error: expected ‘)’ before ‘*’ token
/home/martin/Down/klt/merger.c: In function ‘validate’:
/home/martin/Down/klt/merger.c:68: error: ‘xmlDoc’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:68: error: (Each undeclared identifier is reported only once
/home/martin/Down/klt/merger.c:68: error: for each function it appears in.)
/home/martin/Down/klt/merger.c:68: error: ‘doc1’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:69: error: ‘doc2’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:70: error: ‘xmlIndentTreeOutput’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:71: warning: implicit declaration of function ‘xmlKeepBlanksDefault’
/home/martin/Down/klt/merger.c:72: error: ‘xmlNode’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:72: error: ‘root_element1’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:73: error: ‘root_element2’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:74: error: ‘LIBXML_TEST_VERSION’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:79: error: expected ‘;’ before ‘xmlParserCtxt’
/home/martin/Down/klt/merger.c:80: error: ‘xmlParserCtxt’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:80: error: ‘ctxt2’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:82: error: ‘ctxt1’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:82: warning: implicit declaration of function ‘xmlNewParserCtxt’
/home/martin/Down/klt/merger.c:89: warning: implicit declaration of function ‘xmlCtxtReadFile’
/home/martin/Down/klt/merger.c:96: warning: implicit declaration of function ‘xmlDocGetRootElement’
/home/martin/Down/klt/merger.c:98: warning: implicit declaration of function ‘version_check’
/home/martin/Down/klt/merger.c: At top level:
/home/martin/Down/klt/merger.c:105: error: expected ‘)’ before ‘*’ token
/home/martin/Down/klt/merger.c:154: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
/home/martin/Down/klt/merger.c:194: error: expected ‘)’ before ‘*’ token
/home/martin/Down/klt/merger.c: In function ‘merge’:
/home/martin/Down/klt/merger.c:275: error: ‘xmlDoc’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:275: error: ‘doc1’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:276: error: ‘doc2’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:277: error: ‘xmlIndentTreeOutput’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:279: error: ‘xmlNode’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:279: error: ‘root_element1’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:280: error: ‘root_element2’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:281: error: ‘LIBXML_TEST_VERSION’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:282: error: expected ‘;’ before ‘fprintf’
/home/martin/Down/klt/merger.c:286: error: ‘xmlParserCtxt’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:286: error: ‘ctxt1’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:287: error: ‘ctxt2’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:307: error: ‘XML_FROM_PARSER’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:307: error: ‘XML_ERR_DOCUMENT_EMPTY’ undeclared (first use in this function)
/home/martin/Down/klt/merger.c:352: warning: implicit declaration of function ‘merge_trees’
/home/martin/Down/klt/merger.c:353: warning: implicit declaration of function ‘xmlSaveFormatFileEnc’
/home/martin/Down/klt/merger.c:391: warning: implicit declaration of function ‘xmlFreeDoc’
/home/martin/Down/klt/merger.c:398: warning: implicit declaration of function ‘xmlCleanupParser’
make[2]: *** [CMakeFiles/klt.dir/merger.o] Error 1
make[2]: Leaving directory `/home/martin/Down/klt'
make[1]: *** [CMakeFiles/klt.dir/all] Error 2
make[1]: Leaving directory `/home/martin/Down/klt'
make: *** [all] Error 2

seems like a problem with libxml2 headers. make sure they are in /usr/include and not - try altering the path. I've coded that on ubuntu hardy and everything worked fine for me.. hm. try adjusting the header in the source files to <libxml2/libxml/...h> or as a dirty hack use the absolete paths e.g. include "/usr/include/libxml2/libxml/parser.h"

There should be the LIBXML2 include directory in CMakeLists.txt:

cmake_minimum_required (VERSION 2.6)
project(klt)

#if you don't want the full compiler output, remove the following line
set(CMAKE_VERBOSE_MAKEFILE ON)

#add definitions, compiler switches, etc.
add_definitions(-Wall -g -O2 )

#list all source files here
add_executable(klt main.c merger.c)

#need to link to some other libraries ? just add them here
find_package(LibXml2 REQUIRED)
include_directories("${LIBXML2_INCLUDE_DIR}")
target_link_libraries(klt ${LIBXML2_LIBRARIES})

Quote:* Support log importing from other instant messangers.

This is definitely something I'd love to see. I'm almost done migrating from pidgin to kopete, and only those darned plain text logs are holding me back :)

Here's an example, a part of the script I use to sync my kopete on my pc and laptop. laptop's fs is mounted under /media/coralla:

#!/bin/bash
KLM=/home/aifiltr0/Documentz/dev/C/klt/klm
cd ~/.scripts/
if [ -a "/media/coralla/.kde4" ]; then
$KLM sync /media/coralla/.kde4/share/apps/kopete/logs ~/.kde4/share/apps/kopete/logs
fi