Comment # 3 on bug 936416 from Francois Gouget

Installing harfbuzz-devel.i586 replaces harfbuzz-devel. This makes it
impossible to compile both 32-bit and 64-bit applications using harfbuzz.

Note that this is needed when compiling the MojoSetup installer for instance
since it includes both 32-bit and 64-bit GTK backends into a single 'package'.

This is why packages provide a -devel-32bit package in addition to the x86_64
and i586 -devel ones. See for instance glib2-devel-32bit, pango-devel-32bit or
in different domains, libSDL-devel-32bit, libXcursor-devel-32bit,
alsa-devel-32bit, etc.

So the previous resolution saying to install harfbuzz-devel-0.9.40-4.2.i586.rpm
is incorrect.