diff --git a/_constraints b/_constraints
index 4b58efc..b360d26 100644
--- a/_constraints
+++ b/_constraints
@@ -28,4 +28,22 @@
       </cpu>
     </hardware>
   </overwrite>
+  <overwrite>
+    <conditions>
+      <arch>ppc64le</arch>
+      <arch>s390x</arch>
+    </conditions>
+    <hardware>
+      <physicalmemory>
+        <size unit="G">8</size>
+      </physicalmemory>
+      <memory>
+        <size unit="G">12</size>
+      </memory>
+      <processors>8</processors>
+      <disk>
+        <size unit="G">4</size>
+      </disk>
+    </hardware>
+  </overwrite>
 </constraints>
diff --git a/racket-fortify.patch b/racket-fortify.patch
new file mode 100644
index 0000000..5c57638
--- /dev/null
+++ b/racket-fortify.patch
@@ -0,0 +1,53 @@
+---
+ src/rktio/rktio_fs.c |    4 +++-
+ src/start/ustart.c   |    5 +++--
+ 2 files changed, 6 insertions(+), 3 deletions(-)
+
+--- src/rktio/rktio_fs.c
++++ src/rktio/rktio_fs.c	2024-06-18 12:25:03.035413375 +0000
+@@ -1,6 +1,7 @@
+ #include "rktio.h"
+ #include "rktio_private.h"
+ #include <errno.h>
++#include <limits.h>
+ #include <stdio.h>
+ #include <string.h>
+ #include <sys/stat.h>
+@@ -1092,7 +1093,8 @@ char *rktio_readlink(rktio_t *rktio, con
+     return NULL;
+   }
+ #else
+-  int len, buf_len = 256;
++  ssize_t len;
++  size_t buf_len = PATH_MAX;
+   char *buffer = malloc(buf_len);
+ 
+   while (1) {
+--- src/start/ustart.c
++++ src/start/ustart.c	2024-06-18 12:25:13.635224103 +0000
+@@ -10,6 +10,7 @@
+ #include <string.h>
+ #include <fcntl.h>
+ #include <errno.h>
++#include <limits.h>
+ #include <stdio.h>
+ 
+ #if defined(__GNUC__)
+@@ -266,7 +267,7 @@ int main(int argc, char **argv)
+   char *exe_path, *lib_path, *dll_path;
+   int start, decl_end, prog_end, end, count, fd, v, en, x11;
+   int argpos, inpos, collcount = 1, fix_argv;
+-  int bufsize = 127;
++  size_t bufsize = PATH_MAX;
+ 
+   if (config[7] == '[') {
+     write_str(2, argv[0]);
+@@ -280,7 +281,7 @@ int main(int argc, char **argv)
+ 
+   /* resolve soft links */
+   while (1) {
+-    int len;
++    ssize_t len;
+     char *buf;
+     buf = (char *)malloc(bufsize + 1);
+     len = readlink(me, buf, bufsize);
diff --git a/racket.changes b/racket.changes
index 97efd39..1f081b3 100644
--- a/racket.changes
+++ b/racket.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Fri Jun 21 07:17:41 UTC 2024 - Dr. Werner Fink <werner@suse.de>
+
+- Switch over to pb (Platform without native-code Backend) for
+  architectures which do not build
+- Add patch racket-fortify.patch to make it build with latest gcc
+
 -------------------------------------------------------------------
 Fri May 24 13:46:41 UTC 2024 - Martin Schreiner <martin.schreiner@suse.com>
 
diff --git a/racket.spec b/racket.spec
index bf9886d..9e7123b 100644
--- a/racket.spec
+++ b/racket.spec
@@ -17,6 +17,7 @@
 #
 
 
+%global         _configure ../configure
 Name:           racket
 Version:        8.13
 Release:        0
@@ -28,6 +29,7 @@ Source0:        http://download.racket-lang.org/installers/%{version}/%{name}-%{
 Source2:        racket-completion.bash
 Source3:        racket-rpmlintrc
 Patch0:         racket-doc.patch
+Patch1:         racket-fortify.patch
 BuildRequires:  ImageMagick
 BuildRequires:  ca-certificates
 BuildRequires:  chrpath
@@ -126,16 +128,32 @@ cp -p %{SOURCE2} src/
 
 %build
 cd src/
-
+mkdir build
+pushd build
 %add_optflags -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=500 -fno-gcse -Wno-stringop-overread
+#
+# Overwrite stack size limit (hopefully a soft limit only)
+#
+for flag in s l m
+do
+    ulimit -H$flag unlimited || true
+    ulimit -S$flag unlimited || true
+done
+echo "int main () { return !(sizeof(void*) >= 8); }" | gcc -x c -o test64 -
+echo "int main () { return !(((union {unsigned int x; unsigned char c; }){1}).c); }" | gcc -x c -o testendianess -
+./test64 && wide=64 || wide=32
+./testendianess && endianess=l || endianess=b
+rm -f test64 testendianess
+mach=tpb${wide}${endianess}
+unset wide endianess
 %configure \
     --prefix="%{_prefix}" \
     --exec-prefix="%{_prefix}" \
     --libdir=%{_libdir} \
     --docdir="%{_defaultdocdir}/%{name}" \
     --enable-shared \
-%ifarch ppc64 ppc64le s390x
-    --enable-bcdefault \
+%ifarch ppc64le s390x
+    --enable-pb --enable-mach=$mach \
 %endif
     --disable-static \
     --disable-strip \
@@ -145,9 +163,12 @@ cd src/
     --enable-liblz4 \
     --enable-pthread
 %make_build
+popd
 
 %install
+topdir=$(pwd)
 cd src/
+pushd build
 
 # use the following if setting extra plt_setup options
 # export LD_LIBRARY_PATH=%%{buildroot}%%{_libdir}
@@ -157,6 +178,8 @@ install -d %{buildroot}/%{_datadir}/doc/%{name}/
 
 %make_install
 
+popd
+
 # we do not need *.la and *.a files
 find %{buildroot}%{_libdir} -name "*.la" -delete
 find %{buildroot}%{_libdir} -name "*.a" -delete
@@ -224,6 +247,14 @@ install -m 0644 ../README %{buildroot}%{_docdir}/%{name}/README
 
 %fdupes %{buildroot}%{_prefix}
 
+#
+# Dynamically determine which files gets installed
+# bc, cs, and pb builds
+#
+pushd %{buildroot}%{_libdir}
+    find \( -name '*.boot' -o -name '*.so*' -o -name '*.lo' -o -name '*.o' -o -name bootinfo \) -printf '%{_libdir}/%%P\n' > ${topdir}/file.list
+popd
+
 %post
 /sbin/ldconfig
 %desktop_database_post
@@ -232,7 +263,7 @@ install -m 0644 ../README %{buildroot}%{_docdir}/%{name}/README
 /sbin/ldconfig
 %desktop_database_postun
 
-%files
+%files -f file.list
 %doc %dir %{_docdir}/%{name}
 %doc %{_docdir}/%{name}/README
 %{_bindir}/drracket
@@ -263,21 +294,6 @@ install -m 0644 ../README %{buildroot}%{_docdir}/%{name}/README
 %verify(not md5 size mtime) %{_libdir}/%{name}/*.rktd
 %dir %{_libdir}/%{name}/compiled/
 %{_libdir}/%{name}/compiled/*
-%ifnarch ppc64 ppc64le s390x
-%{_libdir}/%{name}/petite.boot
-%{_libdir}/%{name}/racket.boot
-%{_libdir}/%{name}/scheme.boot
-%endif
-%ifarch ppc64 ppc64le s390x
-%{_libdir}/libracket3m*
-%{_libdir}/%{name}/buildinfo
-%endif
-%ifarch s390x
-%{_libdir}/%{name}/mzdyn3m.o
-%endif
-%ifarch ppc64 ppc64le
-%{_libdir}/%{name}/mzdyn3m.lo
-%endif
 %{_mandir}/man1/mz*
 %{_mandir}/man1/racket*
 %{_mandir}/man1/raco*