$ v -o test.c . 
$ ./vtcc test.c -Iinclude -L. -ltcc1 -lgc -ldl  -lc -lm -lmvec -lpthread bt-log.o bt-exe.o bcheck.o
$ ./a.out -Iinclude -run hello.c

$ v -o vlang.c cmd/v # on vlang dir
$ export tccdir=/path/to/tcc/build/dir
$ vtcc vlang.c -lc -ldl -lpthread -ltcc1 -L$tccdir -L.

$ v -o vlang.c cmd/v # on vlang dir
$ export vtccdir=/path/to/vtcc/dir
$ vtcc -Iinclude -o ./vlang -ldl -lc -lpthread -I$vtccdir/include -L$vtccdir -ltcc1 $vtccdir/bt-exe.o $vtccdir/bt-log.o $vtccdir/bcheck.o vlang.c