Comment # 1 on bug 1026034 from Adam Majer

BuildRequires:  libjpeg-devel
is satisfied by,
%package -n libjpeg%{major}-devel
Provides:       libjpeg-devel = %{version}


BuildRequires: jpeg
is satisfied by,
Name:           libjpeg-turbo
Provides:       jpeg = %{version}


BuildRequires:  libpng-devel
is satisfied by libpng16-devel


So there is no problem here.

You can even use zypper to install/resolve Provides line normal packages.

# zypper in jpeg
Loading repository data...
Reading installed packages...
'jpeg' not found in package names. Trying capabilities.
'libjpeg-turbo' providing 'jpeg' is already installed.
Resolving package dependencies...