Warnings - Build from source

[jiapei100]

Hi, all:

I obtained the following warnings while building Qt from source. My OS env:

1. OS: Ubuntu 20.04
2. Python: 3.8.2
   ➜ ~ python --version Python 3.8.2
3. Qt: qt-everywhere-src-5.15.1

The warnings I obtained:

Note: Also available for Linux: linux-clang linux-icc

Note: The following modules are not being compiled in this configuration:
    webenginecore
    webengine
    webenginewidgets
    pdf
    pdfwidgets

WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.

Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
On macOS, you can use Homebrew's llvm package.
On Windows, you must set LLVM_INSTALL_DIR to the installation path.

WARNING: Python version 2 (2.7.5 or later) is required to build QtWebengine.

WARNING: Python version 2 (2.7.5 or later) is required to build QtPdf.

WARNING: QtWebEngine will not be built.

WARNING: QtPdf will not be built.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/opt'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

4. Additionally, how can I reconfigure from scratch? ./configure clean didn't work .

Thank you very much.

[SGaist]

Hi,

Last question first: do out of source builds, this avoids polluting the sources and if something goes wrong juste nuke the folder and start from scratch.

As for the warnings:

• you do not seem to have clang installed
• Python 2 is requested not 3