It breaks on using - in VSTORAGE-MOUNT definition with:

  In file included from ../config.h:19:0,
  from ../src/util/viraudit.c:22:
  ./meson-config.h:180:17: error: ISO C99 requires whitespace after the macro name [-Werror]
  #define VSTORAGE-MOUNT "/usr/bin/vstorage-mount"
  ^
  ./meson-config.h:180:0: error: "VSTORAGE" redefined [-Werror]
  #define VSTORAGE-MOUNT "/usr/bin/vstorage-mount"
  ^
  ./meson-config.h:178:0: note: this is the location of the previous definition
  #define VSTORAGE "/usr/bin/vstorage"
  ^
  #define VSTORAGE-MOUNT "/usr/bin/vstorage-mount"
---
 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index b5277b4..aff2565 100644
--- a/meson.build
+++ b/meson.build
@@ -1974,7 +1974,7 @@ if conf.has('WITH_LIBVIRTD')
       conf.set('WITH_STORAGE_VSTORAGE', 1)
       foreach name : ['vstorage', 'vstorage-mount', 'umount']
         path = get_variable('@0@_prog'.format(name.underscorify())).path()
-        conf.set_quoted(name.to_upper(), path)
+        conf.set_quoted(name.underscorify().to_upper(), path)
       endforeach
     endif
   endif
--
1.8.3.1