Add note about 32bit libs

build.properties

@@ -18,5 +18,8 @@ i2pdocs.url=http://docs.i2p-projekt.de/javadoc/
 junitdocs.url=http://junit.org/apidocs/
 # This will go in the jar manifests
 build.built-by=unknown	
-# Uncomment the next line to prevent building EXEs (changing it to false will have no impact)
+
+# Building EXEs in Linux requires that 32bit libraries are installed. For example,
+# in Debian installing the libc6-i386 package will satisfy this requirement.
+# Otherwise, uncomment the next line to prevent building EXEs (changing it to false will have no impact)
 #noExe=true