Arch Linux User Repository

Did you read the comments before posting? There is a workaround there.

Sorry for my post @alexei, its ok now.

Same as @JohnRobson

g++ -c -pipe -fno-exceptions -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -Wall -W -D_REENTRANT -fPIC -DSIP_PROTECTED_IS_PUBLIC -Dprotected=public -DQT_NO_DEBUG -DQT_PLUGIN -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4 -I. -I/usr/include/python3.7m -I../qpy/QtCore -I. -o sipQtCoreQObject.o sipQtCoreQObject.cpp
/tmp/yaourt-tmp-test/aur-python2-pyqt4/src/PyQt4_gpl_x11-4.12.3/QtCore/sipQtCoreQObject.cpp:2345:1: error: ne peut convertir « std::nullptr_t » en « int » dans l'initialisation
     SIP_NULLPTR,
 ^
make[1]: *** [Makefile:749: sipQtCoreQObject.o] Error 1
make[1] : on quitte le répertoire « /tmp/yaourt-tmp-test/aur-python2-pyqt4/src/PyQt4_gpl_x11-4.12.3/QtCore »
make: *** [Makefile:60: sub-QtCore-make_default-ordered] Error 2

@alexei Thank you for the clear instructions, it installed okay!

g++ -c -pipe -fno-exceptions -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -Wall -W -D_REENTRANT -fPIC -DSIP_PROTECTED_IS_PUBLIC -Dprotected=public -DQT_NO_DEBUG -DQT_PLUGIN -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4 -I. -I/usr/include/python3.7m -I../qpy/QtCore -I. -o sipQtCoreQObject.o sipQtCoreQObject.cpp
/tmp/yay/pyqt4/src/PyQt4_gpl_x11-4.12.3/QtCore/sipQtCoreQObject.cpp:2345:1: error: cannot convert ‘std::nullptr_t’ to ‘int’ in initialization
     SIP_NULLPTR,
 ^
distcc[1235] ERROR: compile sipQtCoreQObject.cpp on localhost failed
make[1]: *** [Makefile:749: sipQtCoreQObject.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/tmp/yay/pyqt4/src/PyQt4_gpl_x11-4.12.3/QtCore'
make: *** [Makefile:60: sub-QtCore-make_default-ordered] Error 2
==> ERROR: A failure occurred in build().
    Aborting...
Error making: pyqt4 (pyqt4-common python2-pyqt4)

@mark: on line 14, change python-sip python2-sip dependencies to python-sip-pyqt4 python2-sip-pyqt4. EDIT: and remove the former packages if you have them installed.

The error you cite just tells you to install pyqt4-common from AUR, which is a dependency of this package. If you use yaourt (or similar) it fetches dependencies automatically, otherwise you have to install deps manually.

I'm still having trouble installing this.

=>> Select packages to install
  1> pyqt4-common
  2> python-pyqt4
  3> python2-pyqt4

Install [1]: 3
[sudo] password for username: 
loading packages...
resolving dependencies...
warning: cannot resolve "pyqt4-common", a dependency of "python2-pyqt4"
:: The following package cannot be upgraded due to unresolvable dependencies:
      python2-pyqt4

I've added the temporary workaround after configure commands, but I didn't quite get where the rest of the changes should be made. Even though it should build but not work with just this hotfix?

As a temporary workaround, add this after both configure commands in the PKGBUILD:

find . -type f -name '*.cpp' -exec sed -i 's/{SIP_NULLPTR, SIP_NULLPTR, SIP_NULLPTR, SIP_NULLPTR}/{SIP_NULLPTR, SIP_NULLPTR, SIP_NULLPTR, 0}/g' {} \;

Btw, you also must change python-sip/python2-sip dependencies to python-sip-pyqt4/python2-sip-pyqt4, otherwise PyQt will build but the module won't work: import will fail with 'sip' not find, and if you import the default sip, you'll get errors like QtGui.QWidget no attrivute QWidget in QtGui.

Also, you must update python-sip-pyqt4/python2-sip-pyqt4 to 4.19.14 by bumping the version and URL in the PKGBUILD to https://www.riverbankcomputing.com/static/Downloads/sip/sip-4.19.14.tar.gz . Otherwise, 'from PyQt4 import QtGui' will fail with need API v12.6 but sip provides only v12.5.

UPDATE: Also, be careful with versions of sip and python-sip-pyqt packages, it's easy to end up with different versions if you're not careful, and that's probably not good. I ended up simply adding the python-sip-pyqt4 packages to the sip source package PKGBUILD, which already has the python-sip-pyqt5; and uninstalled all sip packages from the system before building and installing the package set from the modified sip PKGBUILD. That way, all sip packages are of the same version. This does not address the underlying issue, though that PyQt4 does not build with latest sip 4.19.14.

UPDATE2: reported to PyQt4: http://python.6.x6.nabble.com/PyQt4-compilation-error-with-sip-4-19-14-convert-std-nullptr-t-to-int-in-initialization-td5248504.html

@kingkingmax > Can you detail more your solution? I am having the same issue.