Weird "undefined reference to" when building pango

 The "undefined reference to" error is a common linker error when building software, and it typically indicates that the linker cannot find a reference to a particular function or symbol in your code. In the context of building Pango, here are some steps to address this error:


1. **Check Dependencies**: Ensure that you have all the necessary dependencies and libraries installed on your system. Pango depends on other libraries, and if those libraries are missing or outdated, you might encounter linker errors. Refer to Pango's documentation or the project's website for a list of dependencies.


2. **Library Path**: Make sure the linker can find the libraries needed by Pango. You may need to specify the library path using the `-L` flag. For example:


   ```bash

   LDFLAGS="-L/path/to/your/library" ./configure

   ```


3. **Library Order**: The order in which you specify libraries can be important. If you're manually specifying libraries, make sure that libraries depending on others come after the ones they depend on. For example, if Pango depends on libraries A and B, and library B depends on library C, you should specify them in this order:


   ```bash

   -lA -lB -lC

   ```


4. **Compiler Flags**: Make sure you're using the correct compiler flags when building Pango. The build system may have specific flags that are required for proper linking. Check Pango's build documentation or the output of `./configure --help` for relevant flags.


5. **Check Config Log**: After running `./configure`, check the generated `config.log` file for any specific errors related to missing libraries or symbols. This can provide valuable information on what is causing the linker errors.


6. **Check Compiler Version**: Ensure you're using a compatible version of the compiler. Sometimes, specific versions of compilers might introduce changes that cause linker errors.


7. **Symbol Visibility**: Be aware of symbol visibility settings. If you are compiling shared libraries or have made changes to the visibility of symbols in your code, it can affect the linkage. Verify that your visibility settings are consistent.


8. **Check Build Scripts**: If you're using a build script or automation tools to build Pango, review the scripts for any issues that might affect linking.


9. **Update and Rebuild**: Sometimes, updating your system's libraries and then rebuilding Pango can resolve the issue, especially if it's related to outdated or incompatible libraries.


10. **Debug Information**: Use debugging tools to get more information about the linker errors. Tools like `ldd` or `nm` can help you inspect shared libraries and symbols.


If you provide more specific details about the linker error message or any other relevant information, I can offer more targeted assistance.

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