With -developer-build make install fails trying to create lib folder in / at host filesystem

Ubuntu 18.04 Qt 5.15 android build after configuring to developer build with:

../configure -xplatform android-clang --disable-rpath -nomake tests -nomake examples -android-ndk /home/rami/Android/Sdk/ndk-bundle/ -android-sdk /home/rami/Android/Sdk -no-warnings-are-errors -prefix /home/rami/builds/Qt/5_15_dbg -developer-build

make install..:

make install

..fail cause snippets.pro (or something after it) tries to create libs folder in the root of Ubuntu file system. If that would be lib - instead of libs - that could compromise the host OS.

Why this needs root priviledges and why it creates folder in the root of the host file system? And not using relative path instead?

cd network/doc/snippets/ && ( test -e Makefile || /home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/bin/qmake -o Makefile /home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qtbase/src/network/doc/snippets/snippets.pro ) && make -f Makefile install
make[3]: Entering directory '/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/src/network/doc/snippets'
/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/bin/qmake -o Makefile /home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qtbase/src/network/doc/snippets/snippets.pro
make -f Makefile.Armeabi-v7a install
make[4]: Entering directory '/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/src/network/doc/snippets'
mkdir: cannot create directory ‘/libs’: Permission denied
Makefile.Armeabi-v7a:357: recipe for target 'install_target' failed
make[4]: *** [install_target] Error 1
make[4]: Leaving directory '/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/src/network/doc/snippets'
Makefile:101: recipe for target 'armeabi-v7a-arm64-v8a-x86-x86_64-install' failed
make[3]: *** [armeabi-v7a-arm64-v8a-x86-x86_64-install] Error 2
make[3]: Leaving directory '/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/src/network/doc/snippets'
Makefile:894: recipe for target 'sub-network-doc-snippets-install_subtargets' failed
make[2]: *** [sub-network-doc-snippets-install_subtargets] Error 2
make[2]: Leaving directory '/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase/src'
Makefile:62: recipe for target 'sub-src-install_subtargets' failed
make[1]: *** [sub-src-install_subtargets] Error 2
make[1]: Leaving directory '/home/rami/dev/docs/JIRA/QTBUG-82617/qt5code/qt5/qt5-bld/qtbase'
Makefile:100: recipe for target 'module-qtbase-install_subtargets' failed
make: *** [module-qtbase-install_subtargets] Error 2

IF run with..

sudo make install

..succeeds.