mxcl/homebrew — pull request #12059 by 2bits (2012-05-04 10:08:22+00:00)
Title: subversion: fix error with clang

Subversion will fail with clang when it queries the compiler
used to build system Python and finds it is llvm-gcc. It then
uses the clang cflags with llvm-gcc to compile the python bindings
which causes the usual unknown `-march=native` flag issue.

Pre-define the configure variable `ac_cv_python_compile` as ENV.cc

Fixes #10914