meson: Check for environ declaration

We use this in various places.

Signed-off-by: Simon McVittie <smcv@collabora.com>

diff --git a/meson.build b/meson.build
index 16dcb67e2fff1b9096157a1729b40ce7cfd9e635..5a51b80828b7ba5a35ae8f95ed009909e4e3df9b 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -629,6 +629,7 @@ config.set10(
     ''')
 )
 
+config.set10('HAVE_DECL_ENVIRON', cc.has_header_symbol('unistd.h', 'environ'))
 config.set10('HAVE_DECL_MSG_NOSIGNAL',
     cc.has_header_symbol('sys/socket.h', 'MSG_NOSIGNAL')
 )