--- libreoffice-6.4.7.2/configure.ac	Tue Feb  1 18:17:23 2022
+++ libreoffice-6.4.7.2/configure.ac.new	Tue Feb  1 19:32:02 2022
@@ -605,10 +605,10 @@
 
     dnl Check whether we're using a SPARC or i386 processor
     AC_MSG_CHECKING([the processor type])
-    if test "$host_cpu" = "sparc" -o "$host_cpu" = "i386"; then
+    if test "$host_cpu" = "sparc" -o "$host_cpu" = "i386" -o "$host_cpu" = "x86_64"; then
         AC_MSG_RESULT([ok ($host_cpu)])
     else
-        AC_MSG_ERROR([only SPARC and i386 processors are supported])
+        AC_MSG_ERROR([only SPARC and i386 processors are supported, not $host_cpu])
     fi
     ;;
 
@@ -4592,6 +4592,11 @@
         RTL_ARCH=x86
         PLATFORMID=solaris_x86
         ;;
+    x86_64)
+        CPUNAME=X86_64
+        RTL_ARCH=X86_64
+        PLATFORMID=solaris_x86_64
+        ;;
     sparc)
         CPUNAME=SPARC
         RTL_ARCH=SPARC