output from dpkg-buildpackage:
g++ main.o linuxspec.o -L/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib -Wl,-Bsymbolic-functions -L/usr/lib/ -lalut -L/usr/lib -lracescreens -lrobottools -lclient -lconfscreens -ltgf -ltgfclient -ltxml -lplibul -lraceengine -llearning -lplibssgaux -lplibssg -lplibsm -lplibsl -lplibsg -lplibul -lglut -lGLU -lGL -lpng -lz -ldl -lopenal -lXrandr -lXrender -lXxf86vm -lXmu -lXi -lXt -lSM -lICE -lXext -lX11 -lm -o torcs-bin
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmLoadingScreenSetText(char*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmShowStandings(void*, RmInfo*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmDriversSelect(void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmPitMenuStart(CarElt*, void*, void (*)(void*))'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RtTrackGetSeg(tTrkLocPos*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmFourStateScreen(char*, char*, char*, void*, char*, char*, void*, char*, char*, void*, char*, char*, void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RtTrackHeightL(tTrkLocPos*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmRaceParamMenu(void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmShowResults(void*, RmInfo*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmLoadingScreenStart(char*, char*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RtTrackLocal2Global(tTrkLocPos*, float*, float*, int)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmFileSelect(void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmTrackSelect(void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmTriStateScreen(char*, char*, char*, void*, char*, char*, void*, char*, char*, void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmDisplayStartRace(RmInfo*, void*, void*)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RtTrackGetWidth(trackSeg*, float)'
/tmp/torcs-1.3.1/build-tree/torcs-1.3.1/export/lib/libraceengine.so: undefined reference to `RmShutdownLoadingScreen()'
collect2: ld returned 1 exit status
Found on oneric.
patch available in debian bug