--- a/mesonbuild/modules/gnome.py
+++ b/mesonbuild/modules/gnome.py
@@ -427,6 +427,10 @@
         scan_command += ['--no-libtool', '--namespace=' + ns, '--nsversion=' + nsversion, '--warn-all',
                          '--output', '@OUTPUT@']
 
+        fallback_libpath = girtarget.get_custom_install_dir()[0]
+        if fallback_libpath is not None and isinstance(fallback_libpath, str) and len(fallback_libpath) > 0 and fallback_libpath[0] == "/":
+            scan_command += ['--fallback-library-path=' + fallback_libpath]
+
         header = kwargs.pop('header', None)
         if header:
             if not isinstance(header, str):