During the compilation I got the following error: cc1: warnings being treated as errors /ufs/goncalve/MonetDB/MonetDB5/src/modules/mal/bpm.mx: In function 'BPMadapt': /ufs/goncalve/MonetDB/MonetDB5/src/modules/mal/bpm.mx:1587: warning: 'vp' may be used uninitialized in this function make[7]: *** [lib_bpm_la-bpm.lo] Error 1 make[7]: Leaving directory `/net/amelia/export/scratch1/goncalve/MonetDB/Stable/MonetDB5/build/src/modules/mal' The function head is here: static str BPMadaptImpl(int *ret, bat *bid, ptr low, ptr hgh, bat *rs, int policy ) { BAT *b,*bs, *bs1, *bs2; Partition ps, p, p2; int (*cmp) (ptr, ptr); ptr nilptr; ValPtr vp; Can I initialize it to NULL? If someone disagree please fix it with the correct value. Regards, Romulo