configure: error: building in source directory is not supported in this release

[fsshl plinlin]

dear gcc advancer user:

  I am try to install gcc in my MAC OS X 7.9, by down load from apple
s website's gcc-5250, but when I did ./configure
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Union-Souths-Computer:~/gcc-5250 UnionSouth$ ./configure
loading cache ./config.cache
checking host system type... powerpc-apple-darwin7.9.0
checking target system type... powerpc-apple-darwin7.9.0
checking build system type... powerpc-apple-darwin7.9.0
checking for a BSD compatible install... /usr/bin/install -c
checking whether ln works... yes
checking whether ln -s works... yes
configure: error: Building in the source directory is not supported in
this release. See http://gcc.gnu.org/install/configure.html for more
details.

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please help
eric