mex unable to find an include file

I'm trying to use mex to compile a file, but it does not seem to be able to find an include file. I am using the test file yprime.c found in matlabapplicationfolder/extern/examples/ folder. The code compiles fine when I type

mex yprime.c

However, I now change the first few lines of the code to include a mpfr include file:

#include <math.h>
#include <mpfr.h>
#include "mex.h"

and I try:

mex 'yprime.c' '-I/usr/local/include/ -L/usr/local/lib/ -lmpfr'

It gives me the error

Error using mex
/Users/username/prog/yprime.c:17:10: fatal error: 'mpfr.h' file not found
#include <mpfr.h>
         ^
1 error generated.

I indeed have:

/usr/local/include/mpfr.h
/usr/local/lib/libmpfr.4.dylib
/usr/local/lib/libmpfr.a
/usr/local/lib/libmpfr.dylib
/usr/local/lib/libmpfr.la

The permissions on all of these are set to 755. I am running OSX 10.10.4. mex -setup returns:

MEX configured to use 'Xcode with Clang' for C language compilation.

[Walter Roberson]

Perhaps try

mex yprime.c -I/usr/local/include/ -L/usr/local/lib/ -lmpfr

[Theo]

It does work! Can you comment as an answer? Also, the reason why I tried the quotation marks was because I was told to do as follows:

mex('yprime.c', '-I/usr/local/include/ -L/usr/local/lib/ -lmpfr')

which is useful if the filenames are specified as Matlab strings in variables. However this syntax does not work! I've tried all the combinations I can think of to call with mex(). How would you call the mex function with variable input?

Answer 1

[Walter Roberson]

Perhaps try

mex yprime.c -I/usr/local/include/ -L/usr/local/lib/ -lmpfr

As a function call this would be

mex('yprime.c', '-I/usr/local/include/', '-L/usr/local/lib/', '-lmpfr')

[Theo]

Works perfectly.