diff --git a/SOURCES/include_stddef.patch b/SOURCES/include_stddef.patch
new file mode 100644
index 0000000..cedc7c2
--- /dev/null
+++ b/SOURCES/include_stddef.patch
@@ -0,0 +1,19 @@
+diff --git a/glu.pc.in b/glu.pc.in
+index 939740d..8bb957a 100644
+--- a/glu.pc.in
++++ b/glu.pc.in
+@@ -9,3 +9,4 @@ Requires: @GLU_REQUIRES@
+ Version: @VERSION@
+ Libs: -L${libdir} -lGLU
+ Libs.private: -lm
++Cflags: -I${includedir}
+diff --git a/src/libutil/error.c b/src/libutil/error.c
+index 7212748..d3b2666 100644
+--- a/src/libutil/error.c
++++ b/src/libutil/error.c
+@@ -30,6 +30,7 @@
+
+ #include "gluos.h"
+ #include "gluint.h"
++#include <stddef.h>
+ #include <GL/glu.h>
diff --git a/SPECS/mesa-libGLU.spec b/SPECS/mesa-libGLU.spec
index 44d9a4a..a80e0d3 100644
--- a/SPECS/mesa-libGLU.spec
+++ b/SPECS/mesa-libGLU.spec
@@ -2,7 +2,7 @@
 
 Name:           mesa-libGLU
 Version:        9.0.0
-Release:        15%{?dist}
+Release:        15%{?dist}.alma
 Summary:        Mesa libGLU library
 
 License:        MIT
@@ -13,6 +13,9 @@ Source2:        make-git-snapshot.sh
 Patch1: 0001-glu-initialize-PriorityQ-order-field-to-NULL-in-pqNe.patch
 Patch2: 0002-Add-D-N-DEBUG-to-CFLAGS-dependent-on-enable-debug.patch
 
+# Fixed in the 9.0.1 version
+Patch9999: include_stddef.patch
+
 BuildRequires:  autoconf automake libtool
 BuildRequires:  mesa-libGL-devel
 #Requires:       
@@ -36,6 +39,8 @@ developing applications that use %{name}.
 %patch1 -p1
 %patch2 -p1
 
+%patch9999 -p1
+
 %build
 autoreconf -v -i -f
 %configure --disable-static
@@ -61,6 +66,9 @@ rm -rf $RPM_BUILD_ROOT%{_datadir}/man/man3/gl[A-Z]*
 %{_libdir}/pkgconfig/glu.pc
 
 %changelog
+* Tue Nov 02 2021 Eduard Abdullin <eabdullin@almalinux.org> - 9.0.0-15.alma
+- Add patch: Include stddef.h for NULL
+
 * Fri Jun 29 2018 Adam Jackson <ajax@redhat.com> - 9.0.0-15
 - Use ldconfig scriptlet macros