Re: [stable build from source] Ubuntu 20.04 scintilla not found

Dear all,

I am still unable to compile stable, due to configure failing to
detect Qscintiilla 2 (current hypothesis). The failing messages in
config.log are

$ grep scintilla config.log
configure:71463: g++ -o conftest -fPIC -g -O2 -pthread -fopenmp
-I/usr/include/x86_64-linux-gnu/qt5/QtNetwork
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtHelp
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtWidgets
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtGui
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtSql
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtXml
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtCore
-I/usr/include/x86_64-linux-gnu/qt5 -fPIC -I/usr/include/suitesparse
conftest.cpp -lQt5Network -lQt5PrintSupport -lQt5Help -lQt5Widgets
-lQt5Gui -lQt5Sql -lQt5Xml -lQt5Core -lqscintilla2-qt5 >&5
/usr/bin/ld: cannot find -lqscintilla2-qt5
configure:71463: g++ -o conftest -fPIC -g -O2 -pthread -fopenmp
-I/usr/include/x86_64-linux-gnu/qt5/QtNetwork
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtHelp
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtWidgets
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtGui
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtSql
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtXml
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtCore
-I/usr/include/x86_64-linux-gnu/qt5 -fPIC -I/usr/include/suitesparse
conftest.cpp -lQt5Network -lQt5PrintSupport -lQt5Help -lQt5Widgets
-lQt5Gui -lQt5Sql -lQt5Xml -lQt5Core -lqscintilla2_qt5 >&5
configure:71463: g++ -o conftest -fPIC -g -O2 -pthread -fopenmp
-I/usr/include/x86_64-linux-gnu/qt5/QtNetwork
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtHelp
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtWidgets
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtGui
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtSql
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtXml
-I/usr/include/x86_64-linux-gnu/qt5
-I/usr/include/x86_64-linux-gnu/qt5/QtCore
-I/usr/include/x86_64-linux-gnu/qt5 -fPIC -I/usr/include/suitesparse
conftest.cpp -lQt5Network -lQt5PrintSupport -lQt5Help -lQt5Widgets
-lQt5Gui -lQt5Sql -lQt5Xml -lQt5Core -lqt5scintilla2 >&5
/usr/bin/ld: cannot find -lqt5scintilla2
octave_cv_lib_qscintilla=no

My system has the library

$ locate scintilla | grep /usr
/usr/include/x86_64-linux-gnu/qt5/Qsci/qsciscintilla.h
/usr/include/x86_64-linux-gnu/qt5/Qsci/qsciscintillabase.h
/usr/lib/libqscintilla2_qt5.so
/usr/lib/libqscintilla2_qt5.so.15
/usr/lib/libqscintilla2_qt5.so.15.0
/usr/lib/libqscintilla2_qt5.so.15.0.0
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/qscintilla2.prf
/usr/share/doc/libqscintilla2-qt5-15
/usr/share/doc/libqscintilla2-qt5-dev
/usr/share/doc/libqscintilla2-qt5-l10n
/usr/share/doc/libqscintilla2-qt5-15/README
/usr/share/doc/libqscintilla2-qt5-15/changelog.Debian.gz
/usr/share/doc/libqscintilla2-qt5-15/copyright
/usr/share/doc/libqscintilla2-qt5-dev/changelog.Debian.gz
/usr/share/doc/libqscintilla2-qt5-dev/copyright
/usr/share/doc/libqscintilla2-qt5-l10n/changelog.Debian.gz
/usr/share/doc/libqscintilla2-qt5-l10n/copyright
/usr/share/qt5/translations/qscintilla_cs.qm
/usr/share/qt5/translations/qscintilla_de.qm
/usr/share/qt5/translations/qscintilla_es.qm
/usr/share/qt5/translations/qscintilla_fr.qm
/usr/share/qt5/translations/qscintilla_pt_br.qm

$ ldconfig -p | grep scintilla
    libqscintilla2_qt5.so.15 (libc6,x86-64) => /lib/libqscintilla2_qt5.so.15
    libqscintilla2_qt5.so (libc6,x86-64) => /lib/libqscintilla2_qt5.so

I thought it could be a naming problem so I created a symbolic link
qt5scintilla2 to ibqscintilla2_qt5 but still doesn't work.