diff -rup a/config.h.in b/config.h.in
--- a/config.h.in	2019-02-01 18:37:54.000000000 -0500
+++ b/config.h.in	2023-01-27 16:41:46.268471003 -0500
@@ -156,6 +156,9 @@
 /* Define to 1 if you have the <GL/glu.h> header file. */
 #undef HAVE_GL_GLU_H
 
+/* Define to 1 if you have the <GL/glx.h> header file. */
+#undef HAVE_GL_GLX_H
+
 /* Define to 1 if you have the <GL/gl.h> header file. */
 #undef HAVE_GL_GL_H
 
@@ -265,6 +268,9 @@
 /* Define to 1 if you have the <OpenGL/glu.h> header file. */
 #undef HAVE_OPENGL_GLU_H
 
+/* Define to 1 if you have the <OpenGL/glx.h> header file. */
+#undef HAVE_OPENGL_GLX_H
+
 /* Define to 1 if you have the <OpenGL/gl.h> header file. */
 #undef HAVE_OPENGL_GL_H
 
diff -rup a/configure b/configure
--- a/configure	2019-02-01 18:37:18.000000000 -0500
+++ b/configure	2023-01-27 16:41:49.570595034 -0500
@@ -14686,7 +14686,7 @@ done
 
 ax_save_CPPFLAGS=$CPPFLAGS
 CPPFLAGS="$GL_CFLAGS $CPPFLAGS"
-for ac_header in GL/gl.h OpenGL/gl.h
+for ac_header in GL/gl.h OpenGL/gl.h GL/glx.h OpenGL/glx.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "
@@ -14838,12 +14838,12 @@ if test "X$ax_cv_check_gl_libgl" != Xno;
 # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
 #   include <windows.h>
 # endif
-# ifdef HAVE_GL_GL_H
-#   include <GL/gl.h>
-# elif defined(HAVE_OPENGL_GL_H)
-#   include <OpenGL/gl.h>
+# ifdef HAVE_GL_GLX_H
+#   include <GL/glx.h>
+# elif defined(HAVE_OPENGL_GLX_H)
+#   include <OpenGL/glx.h>
 # else
-#   error no gl.h
+#   error no glx.h
 # endif
 int
 main ()
diff -rup a/m4/ax_check_gl.m4 b/m4/ax_check_gl.m4
--- a/m4/ax_check_gl.m4	2019-01-10 15:06:22.000000000 -0500
+++ b/m4/ax_check_gl.m4	2023-01-27 15:51:01.163828820 -0500
@@ -56,7 +56,7 @@ AC_CHECK_HEADERS([windows.h])
 
 ax_save_CPPFLAGS=$CPPFLAGS
 CPPFLAGS="$GL_CFLAGS $CPPFLAGS"
-AC_CHECK_HEADERS([GL/gl.h OpenGL/gl.h], , , [
+AC_CHECK_HEADERS([GL/gl.h OpenGL/gl.h GL/glx.h OpenGL/glx.h], , , [
 # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
 #   include <windows.h>
 # endif
@@ -82,12 +82,12 @@ m4_define([AX_CHECK_GL_GLX_PROGRAM],
 # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
 #   include <windows.h>
 # endif
-# ifdef HAVE_GL_GL_H
-#   include <GL/gl.h>
-# elif defined(HAVE_OPENGL_GL_H)
-#   include <OpenGL/gl.h>
+# ifdef HAVE_GL_GLX_H
+#   include <GL/glx.h>
+# elif defined(HAVE_OPENGL_GLX_H)
+#   include <OpenGL/glx.h>
 # else
-#   error no gl.h
+#   error no glx.h
 # endif]],
                            [[glXQueryVersion(0, 0, 0)]])])