This patch provides an update so that nhc98 can be built and works with
a modern C compiler (GCC 11) and libc (glibc 2.33).

diff --git a/Makefile.inc b/Makefile.inc
index 4fbd47a..5bce5c9 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1,6 +1,10 @@
 ### Configurable variables:
 
-OPT = -O3
+# We want C89 semantics plus C++-style comments and things like the
+# 'setjmp_buf' and 'u_short' types.  More importantly, build with '-O1'
+# only to avoid modern optimizations that break the code.
+OPT = -O1 -std=gnu89 -D_GNU_SOURCE=1
+
 #ARCH = -m32
 ARCH = 
 
diff --git a/script/nhc98heap.c b/script/nhc98heap.c
index 534010e..a30d5cd 100644
--- a/script/nhc98heap.c
+++ b/script/nhc98heap.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <ctype.h>
 main(int argc, char **argv)
 {
   int prefix = 1;
diff --git a/src/runtime/Kernel/collector.c b/src/runtime/Kernel/collector.c
index b95a273..1f879c5 100644
--- a/src/runtime/Kernel/collector.c
+++ b/src/runtime/Kernel/collector.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 #include "node.h"
 /*#include "newmacros.h"  -- already included in node.h */
 /*#include "runtime.h"    -- already included in node.h */
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<div class='path'>path: <a href='/guix/log/?id=db7d9e6cabcb6cdba113dfe4d99de18b8cc81301'>root</a>/<a href='/guix/log/.patman?id=db7d9e6cabcb6cdba113dfe4d99de18b8cc81301'>.patman</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/.patman?id=db7d9e6cabcb6cdba113dfe4d99de18b8cc81301&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-10-22 16:09:04 -0400'>2023-10-22</span></td><td><a href='/guix/commit/.patman?id=f44fa21c3ec1d9bf1b9da009e1c795942bf654eb'>gnu: patman: Apply patch for new Change-Id setting.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-01 12:39:11 -0400'>2023-05-01</span></td><td><a href='/guix/commit/.patman?id=f21007ce4aceeacf5bbfc7cd45d526073141f194'>.patman: Remove get_maintainer_script option.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-02-25 23:10:59 -0500'>2023-02-25</span></td><td><a href='/guix/commit/.patman?id=cb0d8100b288b5b0d130820207db17764b7d2140'>.patman: Ignore bad tags.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-12-28 15:36:33 -0500'>2022-12-28</span></td><td><a href='/guix/commit/.patman?id=fde5af3962c8fafc5d20e5d742cc7aea907f3563'>.patman: New configuration file.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
08-27</span></td><td><a href='/guix/commit/THANKS?id=25ae74cffaa95cc4e509e3363f6f6525ddc21672'>Thank Eric Hanchrow.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-23 09:42:24 +0200'>2015-07-23</span></td><td><a href='/guix/commit/THANKS?id=015878fdbbfe5e30474bea229c014677e04cc27f'>Thank Anders.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-22 23:47:35 +0200'>2015-07-22</span></td><td><a href='/guix/commit/THANKS?id=0e9f9f7bc23a7e7f2390eb1bbb09f36f33cda534'>Thank Malcolm.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-22 22:56:42 +0200'>2015-07-22</span></td><td><a href='/guix/commit/THANKS?id=31ea3ebb0570c070df578d5983bdcdce117e4376'>Thank Dave.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-04 12:13:01 +0300'>2015-07-04</span></td><td><a href='/guix/commit/THANKS?id=e7c48ee9519aa5cd094f3326a4caeccba072e9fd'>Clean up 'THANKS' and 'AUTHORS'.</a><span class='msg-avail'>...</span></td><td>Alex Kost</td></tr>
<tr><td><span title='2015-06-07 18:15:40 +0200'>2015-06-07</span></td><td><a href='/guix/commit/THANKS?id=a647e0b8eef9931a46aded4c4d71e0413cc84340'>Thank Thomas.</a></td><td>Ludovic Courtès</td></tr>