When I run this program, I get a fatal error message in the output file:

/home/daf/Fasm/fasm/source/Linux}intel2gas -m < fasm.asm > out.asm
/home/daf/Fasm/fasm/source/Linux}ls -l out.asm
-rw-r--r-- 1 daf daf 209 Jul 5 09:59 out.asm
/home/daf/Fasm/fasm/source/Linux}cat out.asm
Error 0, prev=(null)
fatal error: no /usr/local/share/intel2gas/m2g/main.syntax found
If the syntax files are no longer there, you can set the
I2G_DATA environmental variable to point to the correct directory

However, the 'missing' file is actually there:
-r--r--r-- 1 root bin 6672 Mar 12 19:57 /usr/local/share/intel2gas/m2g/main.syntax

Don't Worry. Be Happy.