My apologies,
I did not read the note in the source file db2uext2.c, where is
writen how to compile on Linux :-)
*** NOTE *** On SCO UnixWare or Linux compile as follows:
cc -D_INCLUDE_POSIX_SOURCE db2uext2.c
-o db2uext2
But, tahnk you very much for you time-finding
for read this Post.
best regards
Trifon