Does Mountain Lion remove headers in /usr/include? Is it just me or common to everybody that all the header files that was in the /usr/include is no longer there?

Which is causing boost bootstrap to fail with this error:

### Using 'darwin' toolset.
###
rm -rf bootstrap
mkdir bootstrap
cc -o bootstrap/jam0 command.c compile.c constants.c debug.c function.c glob.c hash.c  hdrmacro.c headers.c jam.c jambase.c jamgram.c lists.c make.c make1.c object.c option.c output.c parse.c pathunix.c regexp.c rules.c scan.c search.c subst.c timestamp.c variable.c modules.c strings.c filesys.c builtins.c pwd.c class.c native.c md5.c w32_getreg.c modules/set.c modules/path.c modules/regex.c modules/property-set.c modules/sequence.c modules/order.c execunix.c fileunix.c
In file included from command.c:17:
./jam.h:317:10: fatal error: 'sys/types.h' file not found
#include &lt;sys/types.h&gt;
     ^
1 error generated.[/code]
This also happened to me, upgrading to Mountain Lion removed commandline tools. I just needed to go to Xcode and install again. Solved.