Add "Compiling on GNU/Linux fails due to a missing left operand in gnu-linux.h."

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 00dedc0c3631083a05f7b27a58f9541629b2487b..473043932ac7978de0247cee9dec59719b090a0a 100644 (file)
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -2452,6 +2452,27 @@ This results from a bug in a VERY old version of GNU Sed.  To solve
 the problem, install the current version of GNU Sed, then rerun
 Emacs's configure script.
 
+*** Compiling on GNU/Linux fails due to a missing left operand in gnu-linux.h.
+
+The error messages have the form:
+
+  ../src/s/gnu-linux.h:49:24: error: operator '>' has no left operand
+
+This error occurs because your system defines LINUX_VERSION_CODE in
+the standard header file linux/version.h but does not give it a value.
+As a workaround, you can edit the file src/s/gnu-linux.h to add the
+needed definition.  On the line after "#include <linux/version.h>",
+add a line as shown below:
+
+#include <linux/version.h>
+#define LINUX_VERSION_CODE 132626
+
+The number to use depends on your kernel version (the example shown is
+for kernel 2.6.18).  The number can be obtained by running the
+following command in the shell:
+
+uname -r | sed -e 's/\./ /g' -e 's/-.*//' | awk '{print $1*(2^16) + $2*(2^8) + $3}'
+
 *** Building a 32-bit executable on a 64-bit GNU/Linux architecture.
 
 First ensure that the necessary 32-bit system libraries and include