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mex unable to find an include file

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Theo
Theo on 26 Jul 2015
Commented: Theo on 26 Jul 2015
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.

  2 Comments

Walter Roberson
Walter Roberson on 26 Jul 2015
Perhaps try
mex yprime.c -I/usr/local/include/ -L/usr/local/lib/ -lmpfr
Theo
Theo on 26 Jul 2015
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?

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Accepted Answer

Walter Roberson
Walter Roberson on 26 Jul 2015
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')

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