docs: further specify that CFLAGS and friends are only for distro packagers [skip ci]
@@ -52,7 +52,9 @@ executable(..., dependencies : thread_dep)
## Set extra compiler and linker flags from the outside (when e.g. building distro packages)
-The behavior is the same as with other build systems, with environment variables during first invocation.
+The behavior is the same as with other build systems, with environment
+variables during first invocation. Do not use these when you need to rebuild
+the source
```console
$ CFLAGS=-fsomething LDFLAGS=-Wl,--linker-flag meson <options>
