diff -r dd97222683a3 -r 278df575fe4b docs/known-issues.txt
--- a/docs/known-issues.txt	Fri Apr 30 14:33:07 2010 +0200
+++ b/docs/known-issues.txt	Thu Jul 22 23:33:17 2010 +0200
@@ -97,3 +97,25 @@
   Build shared companion libraries.
 
 --------------------------------
+Symptoms:
+  While building the final gcc, I get an error message that ends with:
+    libtool.m4: error: problem compiling FC test program
+
+Explanations:
+  The gc build procedure tries to run a Fortran test to see if it has a
+  working native fortran compiler installed on the build machine, and it
+  can't find one. A native Fortran compielr is needed (seems to be) to
+  build the Fortran frontend of the cross-compiler.
+  Even if you don't want to build the Fortran frontend, gcc tries to see
+  if it has one, but fails. This is no problem, as the Fortran frontend
+  will not be built. There is nothing to be worry about (unless you do
+  want to build the Fortran frontend, of course).
+
+Fix:
+  None so far. It's a spurious error, so there will probably never be
+  a fix for this issue.
+
+Workaround:
+  None needed, it's a spurious error.
+
+--------------------------------