-make <part> ......... Add <part> to the list of parts to be built.
                       Specifying this option clears the default list first.
                       (allowed values: libs, tools, examples, tests,
                       benchmarks, manual-tests, minimal-static-tests)
                       [default: libs and examples, also tools if not
                       cross-building, also tests if -developer-build]
-nomake <part> ....... Exclude <part> from the list of parts to be built.

So, at first I tried:

$ ../qt5/configure -make libs -opengl es2 -sql-mysql -no-gbm -no-kms -no-xcb
+ mkdir -p qtbase
+ cd qtbase
+ exec /home/user/qt5/qtbase/configure -top-level -make libs -opengl es2 -sql-mysql -no-gbm -no-kms -no-xcb
CMake Warning at /home/user/qt5/qtbase/cmake/QtProcessConfigureArgs.cmake:247 (message):
 '-make libs' is not implemented yet.

So why it's listed in the help but not implemented (yet)?

Anyway, also:

../qt5/configure -nomake tools -nomake examples -nomake tests -nomake benchmarks -nomake manual-tests -nomake minimal-static-tests -opengl es2 -sql-mysql -no-gbm -no-kms -no-xcb 
+ mkdir -p qtbase
+ cd qtbase
+ exec /home/user/qt5/qtbase/configure -top-level -nomake tools -nomake examples -nomake tests -nomake benchmarks -nomake manual-tests -nomake minimal-static-tests -opengl es2 -sql-mysql -no-gbm -no-kms -no-xcb
CMake Warning at /home/user/qt5/qtbase/cmake/QtProcessConfigureArgs.cmake:247 (message):
  '-nomake tools' is not implemented yet.

fails.
So how to build only the libraries?