This fixes the build on sparc64. Unsure if the REVISION bump is
necessary.
Index: Makefile
===================================================================
RCS file: /cvs/ports/sysutils/libvirt/Makefile,v
retrieving revision 1.79
diff -u -p -r1.79 Makefile
--- Makefile 4 May 2021 12:32:54 -0000 1.79
+++ Makefile 20 May 2021 14:28:21 -0000
@@ -3,6 +3,7 @@
COMMENT= tool/library for managing platform virtualization
DISTNAME= libvirt-7.3.0
+REVISION= 0
CATEGORIES= sysutils devel emulators
@@ -23,6 +24,10 @@ WANTLIB += sasl2 ssh2 util xml2 yajl
MASTER_SITES= https://libvirt.org/sources/
EXTRACT_SUFX= .tar.xz
+
+# "#error You need at least GCC v4.8 to compile libvirt"
+COMPILER= base-clang ports-gcc
+COMPILER_LANGS= c
MODULES= devel/meson
