MATLAB function block Simulink 255 error

I want to integrate C code using the MATLAB function block( Integrate C code ). When I run the model the next error occurs:

"Building with 'gcc'. In file included from ...work/slprj/_sfprj/untitled1/_self/sfun/src/slprj/_sfprj/untitled1/_self/sfun/src/untitled1_sfun.c:4:0:

...work/slprj/_sfprj/untitled1/_self/sfun/src/slprj/_sfprj/untitled1/_self/sfun/src/untitled1_sfun.h:23:20: fatal error: myheader.h: No such file or directory

gmake: * [untitled1_sfun.o] Error 255".

My header file is on work directory path. Any suggestion?

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I could solve it, but a new error has ocurred.

The new error is:

MEX completed successfully.

/.../MATLAB/R2015a/bin/mex -silent LDFLAGS="\$LDFLAGS " -output untitled1_sfun.mexa64 untitled1_sfun.o untitled1_sfun_registry.o c2_untitled1.o mysource.o

L/.../MATLAB/R2015a/bin/glnxa64 -lmwsf_runtime-

L/.../MATLAB/R2015a/bin/glnxa64 -lfixedpoint-

L/.../MATLAB/R2015a/bin/glnxa64 -lut-

L/.../MATLAB/R2015a/bin/glnxa64 -lemlrt-

L/.../MATLAB/R2015a/bin/glnxa64 -lmwmathutil-

L/.../MATLAB/R2015a/bin/glnxa64 -lmwblas-

L/.../MATLAB/R2015a/bin/glnxa64 -lmwsl_log_load_blocks-

L/.../MATLAB/R2015a/bin/glnxa64 -lmwsimulink-

L/.../MATLAB/R2015a/bin/glnxa64 -lmwipp c2_untitled1.o: Function `sf_gateway_c2_untitled1':

c2_untitled1.c:(.text+0x168d): reference to `mysource' not defined collect2: error: ld return 1 out state

gmake: *** [untitled1_sfun.mexa64] Error 255

mysource is my C code to integrate. I call it in the MATLAB function with 'coder.ceval('mysource',u1,u2,u3);'

[Walter Roberson]

Is your "work directory path" included by way of a "-I" on the command line or in a make file?

[JLP]

In a make file