--- i/meson.build
+++ w/meson.build
@@ -591,8 +591,8 @@ pkgconf = configuration_data()
 
 pkgconf.set('prefix', join_paths(get_option('prefix')))
 pkgconf.set('exec_prefix', '${prefix}')
-pkgconf.set('libdir', '${prefix}/@0@'.format(get_option('libdir')))
-pkgconf.set('includedir', '${prefix}/@0@'.format(get_option('includedir')))
+pkgconf.set('libdir', '${prefix}' / get_option('libdir'))
+pkgconf.set('includedir', '${prefix}' / get_option('includedir'))
 pkgconf.set('VERSION', opus_version)
 pkgconf.set('PC_BUILD', pc_build)
 pkgconf.set('LIBM', libm.found() ? '-lm' : '')