Something

bash-3.00$ gmake -e os=BSD
gmake -C  src all
gmake[1]: Entering directory `/home/alex.thibodeau/RITProj/UDTServer/skynetd/libudt/src'
g++  -fPIC -Wall -Wextra -DBSD -finline-functions -O3 -fno-strict-aliasing  -DIA32 md5.cpp -c
g++  -fPIC -Wall -Wextra -DBSD -finline-functions -O3 -fno-strict-aliasing  -DIA32 common.cpp -c
common.cpp: In static member function `static void CTimer::rdtsc(uint64_t&)':
common.cpp:107: error: impossible constraint in `asm'
common.cpp:104: warning: 'lval' might be used uninitialized in this function
common.cpp:104: warning: 'hval' might be used uninitialized in this function
gmake[1]: *** [common.o] Error 1
gmake[1]: Leaving directory `/home/alex.thibodeau/RITProj/UDTServer/skynetd/libudt/src'
gmake: *** [src.all] Error 2