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-rw-r--r--gcc/doc/install.texi6
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 9e5ba5e..221e60e 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -426,7 +426,11 @@ Necessary when modifying @command{gperf} input files, e.g.@:
@itemx Expect
@itemx Tcl
-Necessary to run the GCC testsuite; see the section on testing for details.
+Necessary to run the GCC testsuite; see the section on testing for
+details. Tcl 8.6 has a known regression in RE pattern handling that
+make parts of the testsuite fail. See
+@uref{http://core.tcl.tk/tcl/tktview/267b7e2334ee2e9de34c4b00d6e72e2f1997085f}
+for more information.
@item autogen version 5.5.4 (or later) and
@itemx guile version 1.4.1 (or later)