Ubuntu下使用make install安装Graphviz的webdot组件时出错

Hey there, let's break down what your sudo make install output is doing for the webdot component, and what you should check next to ensure everything runs smoothly:

First, here's the formatted output from your installation step:

sudo make install
mkdir -p /var/www/cgi-bin /var/www/html
echo "#!/usr/bin/tclsh8.3" > /var/www/cgi-bin/webdot
echo "set LIBTCLDOT /usr/lib/graphviz/libtcldot.so.0.0.0" >> /var/www/cgi-bin/webdot
echo "set CACHE_ROOT /var/cache/webdot" >> /var/www/cgi-bin/webdot
echo "set GS /usr/bin/gs" ……

What each part is doing: #

• mkdir -p /var/www/cgi-bin /var/www/html: Creates the required directories for webdot—cgi-bin holds the executable webdot script, and html is the default web root for any associated web files. The -p flag ensures parent directories are created if they don't exist.
• The series of echo commands builds the /var/www/cgi-bin/webdot Tcl script:
  • #!/usr/bin/tclsh8.3: Sets the interpreter that will run the script (you'll need Tcl 8.3+ installed for this to work).
  • set LIBTCLDOT ...: Points to the Graphviz Tcl library file—this is critical for webdot to access Graphviz's rendering functions.
  • set CACHE_ROOT ...: Defines where webdot will cache generated graph images to improve performance.
  • set GS ...: Specifies the path to Ghostscript, which webdot uses to convert graph outputs to web-friendly formats like PNG or JPEG.

Post-install checks to verify functionality: #

1. Check directory permissions: Ensure /var/www/cgi-bin has execute permissions (run chmod +x /var/www/cgi-bin/webdot if needed), and your web server (e.g., Apache, Nginx) has read access to this directory.
2. Verify library path: Confirm /usr/lib/graphviz/libtcldot.so.0.0.0 exists. If it's in a different location (common on 64-bit systems, like /usr/lib64/graphviz/), edit the LIBTCLDOT line in /var/www/cgi-bin/webdot to match the correct path.
3. Confirm Ghostscript is installed: Run which gs—if it doesn't return /usr/bin/gs, either install Ghostscript or update the GS line in the webdot script to match its actual path.
4. Set up cache directory: Create /var/cache/webdot if it wasn't automatically created, and give your web server user (e.g., www-data on Debian/Ubuntu) read/write permissions with sudo chown www-data:www-data /var/cache/webdot.
5. Configure your web server: For Apache, enable the CGI module (sudo a2enmod cgi) and add a ScriptAlias directive pointing to /var/www/cgi-bin. For Nginx, you'll need to set up a CGI handler like fcgiwrap to execute the webdot script.

内容的提问来源于stack exchange，提问作者Ehsan Momeni Bashusqeh