cc -o interp interp.o xsinit.o `perl -MExtUtils::Embed -e ldopts` 
 xsinit.o: In function `xs_init': 
 xsinit.o(.text+0x14): undefined reference to `boot_Data' 
 xsinit.o(.text+0x2c): undefined reference to `boot_Spreadsheet' 
 xsinit.o(.text+0x44): undefined reference to `boot_Getopt' 
 collect2: ld returned 1 exit status