Problem with Sage's gcc and limits.h

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I have run into two subsystem installs during the execution of their install script: The first was matplotlib, the second during install of mathics.

Both failed due to gcc not being able to find "limit.h"

This is the error sequence for mathics (the install of matplotlib ended the same death):

jahbini@Trismegistus:mathics-0.5$ sage -python setup.py install
running install
running bdist_egg
running egg_info
writing requirements to Mathics.egg-info/requires.txt
writing Mathics.egg-info/PKG-INFO
writing top-level names to Mathics.egg-info/top_level.txt
writing dependency_links to Mathics.egg-info/dependency_links.txt
writing entry points to Mathics.egg-info/entry_points.txt
reading manifest file 'Mathics.egg-info/SOURCES.txt'
writing manifest file 'Mathics.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.8-x86_64/egg
running install_lib
running build_py
running build_ext
skipping 'mathics/core/expression.c' Cython extension (up-to-date)
building 'mathics.core.expression' extension
gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/include/python2.7 -c mathics/core/expression.c -o build/temp.macosx-10.8-x86_64-2.7/mathics/core/expression.o
In file included from /Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/syslimits.h:7:0,
                 from /Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h:34,
                 from /Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/include/python2.7/Python.h:19,
                 from mathics/core/expression.c:16:
/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h:169:62: fatal error: limits.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1

I compiled a dummy prog (t.c) with

#include "limits.h"

and got this:

$gcc -E t.c
# 1 "t.c"
# 1 "<command-line>"
# 1 "t.c"
# 1 "/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h" 1 3 4
# 34 "/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h" 3 4
# 1 "/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/syslimits.h" 1 3 4






# 1 "/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h" 1 3 4
In file included from /Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/syslimits.h:7:0,
                 from /Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h:34,
                 from t.c:1:
/Applications/Sage-5.9-OSX-64bit-10.8.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin12.3.0/4.7.2/include-fixed/limits.h:169:62: fatal error: limits.h ...