[librsvg: 14/23] configure.ac: require gi-docgen

[Marge Bot <marge-bot src gnome org>]

commit 4fceed9b9aae6822b687317cbb63cb2c2befcd0e
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Jan 6 18:01:36 2022 -0600

    configure.ac: require gi-docgen
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/650>

 configure.ac | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/configure.ac b/configure.ac
index 7bded3d07..d4ba325a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -119,6 +119,13 @@ AS_IF(test x$RST2MAN = xno,
     AC_MSG_ERROR([rst2man is required.  Please install python3-docutils.])
 )
 
+dnl Gi-docgen
+
+AC_CHECK_TOOL(GI_DOCGEN, [gi-docgen], [no])
+AS_IF(test x$GI_DOCGEN = xno,
+    AC_MSG_ERROR([gi-docgen is required.  Please install it.])
+)
+
 dnl ===========================================================================
 
 #AC_CANONICAL_HOST