我正在尝试运行配置命令，但它会生成以下错误：我正在运行 Mountain Lion OS X 10.8
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for a sed that does not truncate output... /usr/bin/sed
checking build system type... i386-apple-darwin12.0.0
checking host system type... i386-apple-darwin12.0.0
checking target system type... i386-apple-darwin12.0.0
checking whether the C compiler works... no
configure: error: in `/Users/aditya15417/php-5.4.6':
configure: error: C compiler cannot create executables
See `config.log' for more details.
知道为什么会出现这个错误吗？我已经安装了 Xcode 命令行工具，并且正在从终端运行配置命令。
我有 XCode 4.4，我很确定 gcc 已经安装，因为它给了我：
686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
我试过做：
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer
但它也不起作用。如果需要，这是我的config.log的链接。似乎从日志中找不到gcc4.2
configure:3524: checking for C compiler version
configure:3533: gcc-4.2 --version >&5
./configure: line 3535: gcc-4.2: command not found
configure:3544: $? = 127
configure:3533: gcc-4.2 -v >&5
./configure: line 3535: gcc-4.2: command not found
configure:3544: $? = 127
configure:3533: gcc-4.2 -V >&5
./configure: line 3535: gcc-4.2: command not found
configure:3544: $? = 127
configure:3533: gcc-4.2 -qversion >&5
./configure: line 3535: gcc-4.2: command not found
configure:3544: $? = 127
configure:3564: checking whether the C compiler works
configure:3586: gcc-4.2 conftest.c >&5
./configure: line 3588: gcc-4.2: command not found
configure:3590: $? = 127
configure:3628: result: no
这怎么可能？