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-rw-r--r--docs/reference/gtk/building.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/reference/gtk/building.md b/docs/reference/gtk/building.md
index 2ee660fb05..51c8802168 100644
--- a/docs/reference/gtk/building.md
+++ b/docs/reference/gtk/building.md
@@ -107,7 +107,9 @@ The `plain` build type provided by Meson should only be used when
packaging GTK, and it's expected that packagers will provide their
own compiler flags when building GTK. See the previous section for
the list of environment variables to be used to define compiler and
-linker flags.
+linker flags. Note that with the plain build type, you are also
+responsible for controlling the debugging features of GTK with
+`-DG_ENABLE_DEBUG` and `-DG_DISABLE_CAST_CHECKS`.
## Dependencies {#dependencies}