Configure script fails with numerous "no such file" errors

Just downloaded the 5.15.0 source and started to build it per the instructions.

Upon navigating to the root of the uncompressed source and running ./configure, I get the following:

/Volumes/software/platforms/Mac/dev tools/Qt/source/qt-everywhere-src-5.15.0 % ./configure
+ cd qtbase
+ /Volumes/software/platforms/Mac/dev tools/Qt/source/qt-everywhere-src-5.15.0/qtbase/configure -top-level
usage: dirname path
Creating qmake...
.clang: error: no such file or directory: '/Volumes/software/platforms/Mac/dev'
clang: error: no such file or directory: 'tools/Qt/source/qt-everywhere-src-5.15.0/qtbase/qmake/main.cpp'
clang: error: no input files
make: *** [main.o] Error 1