Besides the stock fc11 x86_64 installation, the following packages have to be installed:

glibc-devel.i586
glibc.i586
libstdc++.i586
readline.i586
readline-devel.i586
mingw32-nsis.x86_64
lyx.x86_64

Without glibc.i586 and libstdc++.i586, configure fails with the complaint that the C or C++ compiler cannot create executables. I'm not sure if readline.i586 was actually necessary. I installed it expecting it to contain libreadline.so, but it turned out that this was actually in readline-devel.i586

To enable compilation of i386 executables on x86_64 machine:

libc6-dev-i386

Borut