Hello,

I need to call a C code using Mathematica via MathLink,
I followed the prescriptions described on the User Guide: I made the template and then I tried to compile the source using the "mcc" script.
(I got the same errors when I try to compile any of the exaples contained in the "MathLinkExamples" folder, so the problem don't concern errors in the C code, I guess)

I got the following error displayed:

/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `shm_open'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_init'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_unlink'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_close'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `pthread_sigmask'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_destroy'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `shm_unlink'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `pthread_create'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_post'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_trywait'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_open'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `sem_wait'
/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions/libML64i3.so: undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status

I guess the problem concerns libraries that are not found, but I still can't find where should I link these libraries.

Thanks