In file included from ../gnome-terminal-3.46.4/src/terminal-screen.cc:36:
/usr/include/sys/sysctl.h:499:2: error: unknown type name 'u_long'

Index: meson.build
--- meson.build.orig
+++ meson.build
@@ -162,7 +162,7 @@ config_h.set('ENABLE_SEARCH_PROVIDER', get_option('sea
 # Enable libc features
 
 libc_feature_defines = [
-  ['_GNU_SOURCE', '1'],
+  ['_BSD_SOURCE', '1'],
   ['_POSIX_C_SOURCE', '200809L'],
   ['_XOPEN_SOURCE', '700'],
   ['_XOPEN_SOURCE_EXTENDED', '1'],