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I just tried updating and compiling GRASS 6.4 svn and got an error compiling r.terraflow. It could be because I am still working out how to compile on Apple OSX 10.8 (Mt. Lion), but the rest of 6.4.3 compiled without errors. I'll list the error here. If this
 is really a bug, I can file a report.
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<div>Michael</div>
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<div>=========== r.terraflow error ============</div>
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<div>Michaels-MacBook-Air:r.terraflow cmbarton$ make</div>
<div>c++ -c -I/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include  -arch i386 -isysroot /Developer/SDKs/MacOSX10.6.sdk   -DUSER=\"cmbarton\" -DNODATA_FIX -D_FILE_OFFSET_BITS=64   -DPACKAGE=\""grassmods"\" -DELEV_FLOAT main.cc -o OBJ.x86_64-apple-darwin12.1.0/FLOAT/main.o</div>
<div>In file included from main.cc:39:</div>
<div>In file included from ./common.h:27:</div>
<div>In file included from /Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/ami.h:39:</div>
<div>In file included from /Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/empq_impl.h:26:</div>
<div>In file included from /Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/empq.h:33:</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/embuffer.h:1123:56: error: </div>
<div>      default arguments cannot be added to an out-of-line definition of a member</div>
<div>      of a class template</div>
<div>long em_buffer<T,Key>::insert(AMI_STREAM<T>* str, long bos=0) {</div>
<div>                                                       ^   ~</div>
<div>In file included from main.cc:39:</div>
<div>In file included from ./common.h:27:</div>
<div>In file included from /Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/ami.h:39:</div>
<div>In file included from /Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/empq_impl.h:26:</div>
<div>In file included from /Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/empq.h:35:</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/iostream/minmaxheap.h:494:7: error: </div>
<div>      reference to non-static member function must be called; did you mean to</div>
<div>      call it with no arguments?</div>
<div>  if (size) {</div>
<div>      ^~~~</div>
<div>          ()</div>
<div>main.cc:181:16: warning: format string is not a string literal</div>
<div>      (potentially insecure) [-Wformat-security]</div>
<div>        G_fatal_error(_("Unable to create temp dir"));</div>
<div>                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/glocale.h:10:16: note: </div>
<div>      expanded from macro '_'</div>
<div>#define _(str) G_gettext(PACKAGE,(str))</div>
<div>               ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>main.cc:191:15: warning: format string is not a string literal</div>
<div>      (potentially insecure) [-Wformat-security]</div>
<div>    G_warning(_("The '-q' flag is superseded and will be removed "</div>
<div>              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/glocale.h:10:16: note: </div>
<div>      expanded from macro '_'</div>
<div>#define _(str) G_gettext(PACKAGE,(str))</div>
<div>               ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>main.cc:367:19: warning: format string is not a string literal</div>
<div>      (potentially insecure) [-Wformat-security]</div>
<div>    G_fatal_error(_("cannot read range"));</div>
<div>                  ^~~~~~~~~~~~~~~~~~~~~~</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/glocale.h:10:16: note: </div>
<div>      expanded from macro '_'</div>
<div>#define _(str) G_gettext(PACKAGE,(str))</div>
<div>               ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>main.cc:389:19: warning: format string is not a string literal</div>
<div>      (potentially insecure) [-Wformat-security]</div>
<div>    G_fatal_error(_("cannot write colors"));</div>
<div>                  ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/glocale.h:10:16: note: </div>
<div>      expanded from macro '_'</div>
<div>#define _(str) G_gettext(PACKAGE,(str))</div>
<div>               ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>main.cc:407:19: warning: format string is not a string literal</div>
<div>      (potentially insecure) [-Wformat-security]</div>
<div>    G_fatal_error(_("cannot read range"));</div>
<div>                  ^~~~~~~~~~~~~~~~~~~~~~</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/glocale.h:10:16: note: </div>
<div>      expanded from macro '_'</div>
<div>#define _(str) G_gettext(PACKAGE,(str))</div>
<div>               ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>main.cc:414:19: warning: format string is not a string literal</div>
<div>      (potentially insecure) [-Wformat-security]</div>
<div>    G_fatal_error(_("cannot write colors"));</div>
<div>                  ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>/Users/Shared/grass_dev/grass64_rb/dist.x86_64-apple-darwin12.1.0/include/grass/glocale.h:10:16: note: </div>
<div>      expanded from macro '_'</div>
<div>#define _(str) G_gettext(PACKAGE,(str))</div>
<div>               ^~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>main.cc:434:44: warning: format specifies type 'int' but the argument has type</div>
<div>      'unsigned long' [-Wformat]</div>
<div>  G_message( "\t\t FILL: %s [%d elements, %dB each]",</div>
<div>                                          ~^</div>
<div>                                          %ld</div>
<div>main.cc:437:45: warning: format specifies type 'int' but the argument has type</div>
<div>      'unsigned long' [-Wformat]</div>
<div>  G_message( "\t\t FLOW: %s [%ld elements, %dB each]",</div>
<div>                                           ~^</div>
<div>                                           %ld</div>
<div>8 warnings and 2 errors generated.</div>
<div>make: *** [OBJ.x86_64-apple-darwin12.1.0/FLOAT/main.o] Error 1</div>
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<div>____________________</div>
<div>C. Michael Barton</div>
<div>Director, Center for Social Dynamics & Complexity </div>
<div>Professor of Anthropology, School of Human Evolution & Social Change</div>
<div>Arizona State University</div>
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voice: <span class="Apple-tab-span" style="white-space: pre; "> </span>480-965-6262 (SHESC), 480-727-9746 (CSDC)<br>
fax:          480-965-7671 (SHESC),  480-727-0709 (CSDC)<br>
<div>www: <a href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>,
<a href="http://csdc.asu.edu">http://csdc.asu.edu</a></div>
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