gcc foo.c -o foo -L. -llua -lm
./liblua.a(loadlib.o): In function `ll_loadfunc':
loadlib.c:(.text+0x8e7): undefined reference to `dlsym'
loadlib.c:(.text+0x8f4): undefined reference to `dlerror'
loadlib.c:(.text+0x9cc): undefined reference to `dlopen'
loadlib.c:(.text+0x9e1): undefined reference to `dlerror'
./liblua.a(loadlib.o): In function `gctm':
loadlib.c:(.text+0xfee): undefined reference to `dlclose'
collect2: ld returned 1 exit status