BuildFactory creates unexecutable binaries

[bbjimmy]

For me, buildfactory has failed to build an executable since yab 1.8.1

---Error in BuildFactory.yab, line 437: stream 1 not open for writing or printing
---Dump: sub DumpProg() called in BuildFactory.yab,437
---Dump: sub BuildFactory() called in BuildFactory.yab,112
---Error: Program stopped due to an error