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You can resolve this issue by following these steps:

1. Install the PostgreSQL development package:

   sudo apt-get update
   sudo apt-get install postgresql-server-dev-all
   

2. Check if libpq-fe.h file exists:

   find /usr -name libpq-fe.h
   

   If the file is found, note the path and proceed to step 3. If not, try installing the package again.

3. Export the header file directory path:

   export C_INCLUDE_PATH=/usr/include/postgresql/
   

4. Compile your program and link it with the PostgreSQL library:

   gcc -o program program.c -lpq
   

   Replace "program" with your program name and "program.c" with your program file name.

5. Run your program:

   ./program