[gssdp] build: fix macOS dylib versioning

[Jens Georg <jensgeorg src gnome org>]

commit 84ac385c0fa6c986e9e9880c617ab14baa393369
Author: Tom Schoonjans <Tom Schoonjans diamond ac uk>
Date:   Thu Mar 14 12:31:27 2019 +0000

    build: fix macOS dylib versioning

 libgssdp/meson.build | 12 +++++++++++-
 meson.build          |  2 +-
 2 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/libgssdp/meson.build b/libgssdp/meson.build
index aa66def..a022609 100644
--- a/libgssdp/meson.build
+++ b/libgssdp/meson.build
@@ -48,8 +48,18 @@ if generic_unix
   sources += 'gssdp-net-posix.c'
 endif
 
+version = '0.0.0'
+version_arr = version.split('.')
+major_version = version_arr[0].to_int()
+minor_version = version_arr[1].to_int()
+micro_version = version_arr[2].to_int()
+current = major_version + minor_version + 1
+interface_age = micro_version
+darwin_versions = [current, '@0@.@1@'.format(current, interface_age)]
+
 libgssdp = library('gssdp-1.2', sources + enums,
-    version : '0.0.0',
+    version : version,
+    darwin_versions : darwin_versions,
     dependencies : dependencies + system_deps,
     include_directories : include_directories('..'),
     install : true)
diff --git a/meson.build b/meson.build
index 7e898eb..3d75cc9 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('gssdp', 'c', version: '1.2.0')
+project('gssdp', 'c', version: '1.2.0', meson_version : '>= 0.48.0')
 gnome = import('gnome')
 pkg = import('pkgconfig')