Add note about need to specify extra compiler flags

with recent Cygwin ports of gcc.

1 files changed, 10 insertions, 1 deletions

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index e800be58ca1..56a67611982 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -16,7 +16,16 @@ automatically with Emacs 21 and later.)
 Note that this problem does not pertain to the MS-Windows port of
 Emacs, since it doesn't use the preprocessor to generate Makefile's.
 
-* Building the Windows port with Leim fails in the `leim' directory.
+* Building the MS-Windows port with Cygwin GCC can fail.
+
+Emacs may not build using recent Cygwin builds of GCC, such as Cygwin
+version 1.1.8, using the default configure settings.  It appears to be
+necessary to specify the -mwin32 flag when compiling, and define
+__MSVCRT__, like so:
+
+  configure --with-gcc --cflags -mwin32 --cflags -D__MSVCRT__
+
+* Building the MS-Windows port with Leim fails in the `leim' directory.
 
 The error message might be something like this: