C headers

Dear list,

Just upgraded to MacOS Mavericks, fresh install of R 3.0.2 and trying to
install a previous version of my QCA package (the most recent one source
file, which passed the R CMD check --as-cran with R 3.0.1)

I seem to have some difficulties in the C code, apparently it doesn't find
some headers (please see below):

============
$ R CMD INSTALL --no-multiarch QCA.history/QCA_1.1-1.tar.gz
* installing to library
???/Library/Frameworks/R.framework/Versions/3.0/Resources/library???
* installing *source* package ???QCA??? ...
** libs
llvm-gcc-4.2 -arch x86_64 -std=gnu99
-I/Library/Frameworks/R.framework/Resources/include -DNDEBUG
  -I/usr/local/include    -fPIC  -mtune=core2 -g -O2  -c allSol.c -o allSol.o
In file included from allSol.c:1:
/Library/Frameworks/R.framework/Resources/include/R.h:28:20: error:
stdlib.h: No such file or directory
/Library/Frameworks/R.framework/Resources/include/R.h:29:73: error:
stdio.h: No such file or directory
In file included from
/Library/Frameworks/R.framework/Resources/include/R.h:30,
                  from allSol.c:1:
/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/include/limits.h:15:25:
error: limits.h: No such file or directory
In file included from allSol.c:1:
/Library/Frameworks/R.framework/Resources/include/R.h:31:18: error: math.h:
No such file or directory
In file included from
/Library/Frameworks/R.framework/Resources/include/R.h:44,
                  from allSol.c:1:
/Library/Frameworks/R.framework/Resources/include/R_ext/RS.h:26:47: error:
string.h: No such file or directory
In file included from allSol.c:2:
/Library/Frameworks/R.framework/Resources/include/Rinternals.h:862: error:
expected declaration specifiers or ???...??? before ???FILE???
/Library/Frameworks/R.framework/Resources/include/Rinternals.h:865: error:
expected declaration specifiers or ???...??? before ???FILE???
allSol.c: In function ???allSol???:
allSol.c:62: warning: implicit declaration of function ???div???
allSol.c:62: error: request for member ???quot??? in something not a structure
or union
allSol.c:62: error: request for member ???rem??? in something not a structure
or union
allSol.c:213: error: request for member ???quot??? in something not a structure
or union
allSol.c:213: error: request for member ???rem??? in something not a structure
or union
allSol.c:279: error: request for member ???quot??? in something not a structure
or union
allSol.c:279: error: request for member ???rem??? in something not a structure
or union
make: *** [allSol.o] Error 1
ERROR: compilation failed for package ???QCA???
* removing
???/Library/Frameworks/R.framework/Versions/3.0/Resources/library/QCA???
* restoring previous
???/Library/Frameworks/R.framework/Versions/3.0/Resources/library/QCA???
============

It doesn't find stdlib.h, stdio.h, limits.h, math.h, string.h (etc,
basically all important ones).

I have Xcode version 5.0.2 installed, do I need anything else installed in
the system?

Thank you,
Adrian