ok heres what gdb makes of the core:
Core was generated by `lyx'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/libexec/ld.so...done.
Reading symbols from /usr/X11R6/lib/libforms.so.0.86...done.
Reading symbols from /usr/X11R6/lib/libXpm.so.4.6...done.
Reading symbols from /usr/X11R6/lib/libSM.so.6.0...done.
Reading symbols from /usr/X11R6/lib/libICE.so.6.0...done.
Reading symbols from /usr/lib/libc.so.12.5...done.
Reading symbols from /usr/lib/libm.so.0.1...done.
Reading symbols from /usr/X11R6/lib/libX11.so.6.1...done.
#0  0x40a9f8c in fl_addto_browser ()

fl_addto_browser is a xforms thing. doing grep -l fl_addto_browser * in 
/usr/X11R6/lib got me this:
libforms.a
libforms.so
libforms.so.0.81
libforms.so.0.86
is this an xforms bug? or is it because i compiled lyx with the 81 header 
file and am using the 86 shard lib (ok before you kill me becausee this 
has been the problem all along, let me explain: using the 86 header makes 
compiling not work)
-xiamin just doesnt give up when he should...