### Option 1: Setting the `LD_LIBRARY_PATH` Environment Variable
You can temporarily add the directory containing `libcppcms.so.2` to the `LD_LIBRARY_PATH` environment variable.
```sh
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
./learnCppcms -c config.js
```
Replace `/usr/local/lib` with the actual path to the directory where `libcppcms.so.2` is installed.
### Option 2: Adding the Library Path to `/etc/ld.so.conf`
For a more permanent solution, you can add the library directory to the `/etc/ld.so.conf` file and run `ldconfig` to update the linker cache.
1. Open `/etc/ld.so.conf` in a text editor with root permissions:
```sh
sudo nano /etc/ld.so.conf
```
2. Add the directory containing `libcppcms.so.2` (e.g., `/usr/local/lib`).
3. Save the file and exit the text editor.
4. Run `ldconfig` to update the linker cache:
```sh
sudo ldconfig
```
### Option 3: Using a Wrapper Script
You can create a simple shell script to set the `LD_LIBRARY_PATH` environment variable before running your application:
1. Create a file named `run_learnCppcms.sh`:
```sh
nano run_learnCppcms.sh
```
2. Add the following content to the file:
```sh
#!/bin/bash
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
./learnCppcms -c config.js
```
Replace `/usr/local/lib` with the actual path to the directory where `libcppcms.so.2` is installed.
3. Make the script executable:
```sh
chmod +x run_learnCppcms.sh
```
4. Run your application using the script:
```sh
./run_learnCppcms.sh
```
### Additional Steps
1. **Ensure Libraries are Installed**: Verify that `libcppcms.so.2` is actually installed on your system. You can search for the file using:
```sh
sudo find / -name libcppcms.so.2
```
2. **Check Symbolic Links**: Sometimes the issue is caused by missing symbolic links. Ensure that `libcppcms.so.2` is correctly linked in your library directory. For example, if the actual file is `libcppcms.so.2.0.0`, you might need to create a symlink:
```sh
sudo ln -s /path/to/libcppcms.so.2.0.0 /usr/local/lib/libcppcms.so.2
``