[Discuss-gnuradio] Error while compiling a processing block

[Francesco B.]

Hello all,

I've been spending the past several weeks getting acquainted with GNU Radio,
and have reached the point of wanting to go through the task of creating my
own processing block. To this end, I've written a modified version of the
signal generating block (gr_sig_source_X.*), and attempted to follow the
tutorial floating about by Dawei Shen in order to compile it. However, after
proceeding through that (substituting file names used in the tutorial for my
own), I get the following error message:

' is already registered with AC_CONFIG_FILES.
../../lib/autoconf/status.m4:300: AC_CONFIG_FILES is expanded from...
configure.ac:126: the top level
autom4te-2.61: /usr/bin/m4 failed with exit status: 1
aclocal-1.10: autom4te failed with exit status: 1
' is already registered with AC_CONFIG_FILES.
../../lib/autoconf/status.m4:300: AC_CONFIG_FILES is expanded from...
configure.ac:126: the top level
autom4te-2.61: /usr/bin/m4 failed with exit status: 1
' is already registered with AC_CONFIG_FILES.
../../lib/autoconf/status.m4:300: AC_CONFIG_FILES is expanded from...
configure.ac:126: the top level
autom4te-2.61: /usr/bin/m4 failed with exit status: 1
autoheader-2.61: '/usr/bin/autom4te-2.61' failed with exit status: 1
' is already registered with AC_CONFIG_FILES.
../../lib/autoconf/status.m4:300: AC_CONFIG_FILES is expanded from...
configure.ac:126: the top level
autom4te-2.61: /usr/bin/m4 failed with exit status: 1
automake-1.10: autoconf failed with exit status: 1

It looks as though it's simply the same error repeated multiple times,
before automake gives up on it. Also appears to be originating from
configure.ac, which makes sense since that was a file that differed in
appearance from the tutorial. I attempted modifying the existing
configure.ac, while only substituting the name of the folder where the block
is contained [GR_STANDALONE(gr-howto-write-a-block,3.1.svn)], and that's
where the error first showed up. I also tried swapping out the configure.ac
for one from an earlier version of gr-howto-write-a-block, and change
precisely as the tutorial suggested (modifying just the two lines), but
still got the error. Has anyone encountered something like this before, or
know a solution to it?

~ Francesco
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