./configure can't find C compiler after OS X Lion installation

Question

While cc and gcc are perfectly in their right path (/Developer/usr/bin in OS X Lion), running ./configure tries to compile it

Answer 1

I recently installed OSX Mavericks and wanted to upgrade to php 5.5.5 and faced a similar issue

[user@host /path/to/php5.5.5_src]$ ./configure
checking for cc... cc
checking whether the C compiler works... no

Looking at my include path, I noticed that only de base Xcode path was added (I have Xcode 5)

[user@host ~]$ cat /etc/paths
/usr/bin
/Applications/Xcode.app/Contents/Developer/usr/bin
/bin
...

All I needed to do is add the path to the Toolchains

[user@host ~]$ sudo vi /etc/paths
/usr/bin
/Applications/Xcode.app/Contents/Developer/usr/bin
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
/bin
...

And voilà, it found it.

[user@host /path/to/php5.5.5_src]$ ./configure
checking for cc... cc
checking whether the C compiler works... yes

Hope this helps.