[MacPorts] #67254: R-Rcpp fails to build on Tiger: fatal error: execinfo.h: No such file or directory

[MacPorts]

#67254: R-Rcpp fails to build on Tiger: fatal error: execinfo.h: No such file or
directory
--------------------------+--------------------------
 Reporter:  barracuda156  |      Owner:  barracuda156
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:  tiger         |       Port:  R-Rcpp
--------------------------+--------------------------
 {{{
 * installing *source* package ‘Rcpp’ ...
 ** package ‘Rcpp’ successfully unpacked and MD5 sums checked
 ** using staged installation
 ** libs
 /opt/local/bin/g++-mp-7 -std=gnu++14
 -I"/opt/local/Library/Frameworks/R.framework/Resources/include" -DNDEBUG
 -I../inst/include/  -isystem/opt/local/include/LegacySupport
 -I/opt/local/include   -fPIC  -pipe -Os -arch ppc  -c api.cpp -o api.o
 In file included from ../inst/include/Rcpp.h:59:0,
                  from api.cpp:26:
 ../inst/include/Rcpp/exceptions_impl.h:38:12: fatal error: execinfo.h: No
 such file or directory
  #  include <execinfo.h>
             ^~~~~~~~~~~~
 compilation terminated.
 make: *** [api.o] Error 1
 ERROR: compilation failed for package ‘Rcpp’
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67254>
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