sa-exim

Üdv!
Az sa-exim-etszeretném lefordítani mivel ezt a feladatot kaptam, de az alábbi érdekességeket írja a make parancs után:
echo "char *version=\"`cat version` (built `date -R 2>/dev/null || date`)\";" >
sa-exim.h
Building sa-exim-4.2.1.so
gcc -I/usr/local/src/exim4-4.63 -I./eximinc -DDLOPEN_LOCAL_SCAN -DSPAMASSASSIN_CONF=\"/etc/exim4/sa-exim.conf\" -DSPAMC_LOCATION=\"/usr/bin/spamc\" -O2 -Wall -shared -o sa-exim-4.2.1.so sa-exim.c
sa-exim.c: In function 'get_header':
sa-exim.c:165: warning: pointer targets in passing argument 1 of 'string_copyn'
differ in signedness
sa-exim.c:165: warning: pointer targets in assignment differ in signedness
sa-exim.c: In function 'savemail':
sa-exim.c:203: warning: pointer targets in passing argument 1 of 'expand_string' differ in signedness
sa-exim.c:203: warning: pointer targets in assignment differ in signedness
sa-exim.c:207: warning: pointer targets in assignment differ in signedness
sa-exim.c:231: warning: pointer targets in passing argument 1 of 'stat' differ in signedness
sa-exim.c:237: warning: pointer targets in assignment differ in signedness
sa-exim.c:239: warning: pointer targets in passing argument 1 of 'mkdir' differ
in signedness
....
chmod a+rx sa-exim-4.2.1.so
Building accept.so
gcc -I/usr/local/src/exim4-4.63 -I./eximinc -DDLOPEN_LOCAL_SCAN -DSPAMASSASSIN_CONF=\"/etc/exim4/sa-exim.conf\" -DSPAMC_LOCATION=\"/usr/bin/spamc\" -O2 -Wall -shared -o accept.so accept.c
chmod a+rx accept.so
Generating sa.html
Generating CHANGELOG
Generating ACKNOWLEDGEMENTS

Nem tudom, hogy ezek a warning-ek problémát okoznak e? Meg amúgy nem hozza létre a sa-exim.so fájlt. Ennek mi az oka?