returnImplicitInt
ftp://ftp.de.debian.org/debian/pool/main/g/gforth/gforth_0.7.3+dfsg.orig.tar.xz
2.17.0 gforth-0.7.3.orig/engine/io.c:265:1: portability: Omitted return type of function 'restart_output' defaults to int, this is not supported by ISO C99 and later standards. [returnImplicitInt]