The build just endlessly spams: Say yes, no or always: Use of uninitialized value $ln in pattern match (m//) at make.pl line 626. Use of uninitialized value $ln in pattern match (m//) at make.pl line 629. Use of uninitialized value $ln in pattern match (m//) at make.pl line 632. Use of uninitialized value $ln in pattern match (m//) at make.pl line 636.