build gcc for rtems4.11 toolchains in ubuntu

[Adam Jensen]

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It might help to set or pass some environment variables for
configure and/or gmake (e.g., C_INCLUDE_PATH).

http://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html

./configure GCCVERSION=... \
            COMPILER_PATH=... \
	    LIBRARY_PATH=... \
            CPATH=... \
            C_INCLUDE_PATH=... \
            CPLUS_INCLUDE_PATH=... \
            CC=... \
            CPP=... \
            CXX=...

gmake GCCVERSION=... \
      COMPILER_PATH=... \
      LIBRARY_PATH=... \
      CPATH=... \
      C_INCLUDE_PATH=... \
      CPLUS_INCLUDE_PATH=... \
      CC=... \
      CPP=... \
      CXX=...

Of course, replace ... with values appropriate for your system.


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