1 files changed, 19 insertions, 12 deletions

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 8c6a37dbd45..2fc0e29b30f 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -1037,7 +1037,7 @@ into Meta.  This is because of the great importance of Meta in Emacs.
 
 This happens sometimes when using Metacity.  Resizing Emacs or ALT-Tab:bing
 makes the system unresponsive to the mouse or the keyboard.  Killing Emacs
-or shifting out from X11 and back again usually cures it (i.e. Ctrl-Alt-F1 
+or shifting out from X11 and back again usually cures it (i.e. Ctrl-Alt-F1
 and then Alt-F7).  A bug for it is here:
 https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/231034.
 Note that a permanent fix seems to be to disable "assistive technologies".
@@ -1514,7 +1514,7 @@ One way to cure this is to disable flow control on the local host
 (the one running rlogin, not the one running rlogind) using the
 stty command, before starting the rlogin process.  On many systems,
 "stty start u stop u" will do this.  On some systems, use
-"stty -ixon" instead. 
+"stty -ixon" instead.
 
 Some versions of tcsh will prevent even this from working.  One way
 around this is to start another shell before starting rlogin, and
@@ -2339,17 +2339,10 @@ files are installed. Then use:
 
 (using the location of the 32-bit X libraries on your system).
 
-*** Building the Cygwin port for MS-Windows can fail with some GCC versions
+*** Building Emacs for Cygwin can fail with GCC 3
 
-Building Emacs 22 with Cygwin builds of GCC 3.4.4-1 and 3.4.4-2 is
-reported to either fail or cause Emacs to segfault at run time.  In
-addition, the Cygwin GCC 3.4.4-2 has problems with generating debug
-info.  Cygwin users are advised not to use these versions of GCC for
-compiling Emacs.  GCC versions 4.0.3, 4.0.4, 4.1.1, and 4.1.2
-reportedly build a working Cygwin binary of Emacs, so we recommend
-these GCC versions.  Note that these versions of GCC, 4.0.3, 4.0.4,
-4.1.1, and 4.1.2, are currently the _only_ versions known to succeed
-in building Emacs (as of v22.1).
+As of Emacs 22.1, there have been stability problems with Cygwin
+builds of Emacs using GCC 3.  Cygwin users are advised to use GCC 4.
 
 *** Building the native MS-Windows port fails due to unresolved externals
 
@@ -2440,6 +2433,20 @@ several workarounds for this problem:
         2. Install the latest Windows SDK.
         3. Replace emacs.ico with an older or edited icon.
 
+*** Building the MS-Windows port complains about unknown escape sequences.
+
+Errors and warnings can look like this:
+
+ w32.c:1959:27: error: \x used with no following hex digits
+ w32.c:1959:27: warning: unknown escape sequence '\i'
+
+This happens when paths using backslashes are passed to the compiler or
+linker (via -I and possibly other compiler flags); when these paths are
+included in source code, the backslashes are interpreted as escape sequences.
+See http://lists.gnu.org/archive/html/emacs-devel/2010-07/msg00995.html
+
+The fix is to use forward slashes in all paths passed to the compiler.
+
 ** Linking
 
 *** Building Emacs with a system compiler fails to link because of an